ISG Headquarters


Meet the team behind ISG Headquarters

Mag. Elifa Velagic

Senior Consultant


Elifa Velagic completed her studies in International Business Administration with an emphasis on International Business, Human Resource Management and Austrian & European Labour and Employment Law.

During her studies she participated in several exchange programs in Kiev, Hanoi or Yogyakarta and got the possibility to enhance her technical and intercultural competences. She also gained practical experience from several internships, especially in the field of recruiting at a well-known Austrian company.

At the end of 2010 Elifa Velagic started her career at ISG. As a Consultant she is responsible for international Search & Selection Projects and supports customers of different sectors and industries.

Motto: „To be able to start is strength. To be able to finish is power.” Lao-Tse


Mag. Birgit Prochazka

Senior Consultant


Since 2004, Ms. Prochazka has been working for ISG. She is ISG’s expert in the health care, medical devices and pharmaceutical industry, as well as in the field of FMCG and renewable energy, covering the DACH- and CEE-Region. Together with her team, she focuses on leadership and senior specialist roles. In 2006, the power of attorney was assigned to her.

Previously, she was in the consulting business. She lived and worked for a top management consulting and education company, the Management Zentrum St. Gallen, in Switzerland and was able to gain experience abroad. Subsequently, Ms. Prochazka worked for the same company from an Austrian location (serving clients in Austria, Germany and Switzerland). Particularly, she dealt with soft skills topics: Change Management, Leadership, Corporate Culture and Human Resources Management. With reference to Human Resources her responsibilities included the development of concepts and the execution of management education programs. The main focus was on issues arising from the health care sector.

Ms. Prochazka studied psychology with focus on industrial and economic psychology. In 2000, she received an honorary award by the Austrian Federal Ministry of Education, Science and Culture for outstanding studying performances.

For nearly 10 years Ms. Prochazka (née Geitzenauer) was employed in a well-known Austrian hospital as a nurse. Additionally, she worked on nursing-quality management and introductory programs for new employees and mentoring of nursing students.


  • Headhunting as well as classic search and selection for leadership and senior specialist roles
  • Management of international recruiting and headhunting projects
  • Implementation of assessment centers and potential analyses

Mag. Silvia Karnitsch

Senior Consultant, Bewerbungs- & Karrierecoach


During her studies of organizational- & economic psychology and a 2 year fulltime course of market communication & advertising Silvia Karnitsch was working at renowned advertising agencies as market researcher and strategic planner.

After finishing her studies (focus on diagnostics & economic psychology) in 2006 she conducts her career as international sales & marketing specialist (CEE & Asia) at the worldwide leading company for psychological computerized test procedures.

Business Development, establishing new partner agencies around the world, consulting of HR clients, and analysing and improvement of HR solutions were her main tasks.

She supported companies & institutions with the implementation of personnel selection- and development tools, held workshops and trainings (inland & abroad), and she was strongly cooperating with the intern Research & Development and IT department to develop new tools.

For a deeper and more direct HR access she decided to join ISG Vienna in October 2008. She is consultant with a focus on sales positions. Her clients are from industry, trading, science and economic. She also supports job seeking persons as well as persons who are looking for a new career opportunity as application- & careercoach.

What counts for her: open and direct communication with clients AND applicants, fast and longlasting results, satisfied customers at company side AS WELL AS at application side.

Motto: When walking – walk! When sitting – sit! And above all: don’t seesaw.


Olympia Anna Blanck, MA

Head of CEE & Prokurist


Ms. Blanck studied Economics and Business Psychology with a focus on Human Resource Management at the University of Applied Sciences in Wiener Neustadt.

She is originally from Bratislava where she gained extensive professional experience within an international working environment.

Her professional career commenced at the Delegation of the European Commission, furthermore she worked in an international marketing agency for cross-border projects and she carried out work for a law consultancy with a focus on Central & Eastern Europe.

Maintaining a consistently high standard of work, enthusiasm and intercultural competence gained through her experience puts Ms. Blanck in the position to be a competent contact partner for national and international clients.

Her areas of expertise:

  • Executive Search / Headhunting
  • International recruiting with a focus on Austria and Central & Eastern Europe
  • Personnel consulting, search & selection of managers- and specialists positions
  • Interim management
  • Coordination of cross-border projects in the DACH region (Germany, Austria, Switzerland) as well as in CEE region.
  • Career consultancy.

Her industry focus:

Industrial sector: automotive, aviation, chemical industry, food processing, packaging industry, energy and construction
Service sector: legal consultancy, tax and audit advisory, marketing and advertising, financial services, tourism and transport
Trade: import, export, retail, wholesale
Motto: „The journey is the destination” (Confucius)


Katharina Rudolf, MA

Managing Partner


As part of her bachelor’s degree in “Management – Entrepreneurship”, Katharina Rudolf has specialized in HR management and gained professional experience in this area. While studying for her master’s degree in “European Economy & Business Management”, she worked in an Austrian boutique recruitment consultancy, where she gained experience in particular in the areas of IT and telecommunications, finance, industry and in the start-up industry.

Katharina Rudolf has been Managing Partner of the ISG in Vienna since 2018 and serves currently national and international clients in the areas of IT, industry and healthcare.

Her IT affinity and strong customer and candidate-driven approach characterizes her work as well as trust, discretion and flexibility.

Personal industry focus:

  • General Industrials
  • Packaging Industry
  • IT & New Technologies
  • Healthcare & Life Science
  • Chemicals & Materials
  • Start-up Industry

Motto: “Hire Character. Train Skill” (Peter Schutz)


Mag. Thomas Bauer

Managing Partner


After completing his studies in commercial sciences with focus on marketing and logistics at the University of Economics in Vienna, Thomas Bauer started his career as salesman and project manager in an IT personnel service company, where he gained his initial experiences in finding specialists with very specific skill sets.

After an excursion into the branded article industry as key account manager he began his career in the logistics sector and joined a young express transport company, where he worked his way from salesman to branch manager to operations director.

2003 he changed to a subsidiary of an international express service provider and became managing director of the Austrian and Hungarian national organizations. Thomas Bauer worked at this company for more than 10 years and also provided support with interim management tasks in other Eastern European countries. Personnel development, finding and fostering the appropriate team members as well as a modern leadership concept were always key elements of his management goals.

2014 he accepted the position of operations director in the German affiliate company and managed a turnaround process until the sales of the organization in the summer of 2016.

After a short employment at the express subsidiary of a large Austrian forwarder, he finally fulfilled his long-held ambition to become a self-employed consultant and partner in the area of personnel management and, thus, became partner of ISG focusing on transport and logistics.

He specializes in positions at all levels in the logistics, transport and SCM area and supports his clients with the search and selection of the best candidates in this very competitive market through his experiences and his network.

Motto: “The secret to success is to understand the viewpoint of others.” (Henry Ford)


Dr. Gerhard Klein

Senior Consultant


In addition to studying journalism and political science at the University of Vienna, Gerhard Klein worked for ORF (Austrian Radio and TV Station).

After graduation he worked as an editor in a publishing house for seven years, where he acquired proficiency and experience in the media sector. Then he changed to ” the client side ” and was (again, seven years) responsible for public relations and various prevention projects for “Aids Hilfe Wien”. He is the winner of the Print-Oscar (best PR project in Austria), was Head of the International Fundraising Group, Executive Editor of “Radio PosiHIV ” and chief editor of the television series “TV + “.

For two years he took over the PR of “SDW” (addiction and drug coordinaton in Vienna) and also served as press spokesman for the Vienna drug coordinator. In this position he worked closely with the City of Vienna.

Since 2009 he has been working as a consultant for ISG and supports his customers in the fields of:

  • Staffing / Recruiting
  • Executive Search
  • Newplacement

Motto: „Today is the beginning of the rest of your life“ Carpe diem


Ing. Andreas Lassel

Managing Partner


After passing his final exams at the Higher Technical College for Mechanical Engineering Andreas Lassel commenced his professional career in the field of construction of specialised mechanical applications.
Besides being responsible for technical purchases he quickly took on the running of the design department as well as overseeing the production and installation of specialised machinery.

Due to his commitment and his outstanding technical and management knowledge he was entrusted with the complete running of the technical branch and in addition also taking on matters for the Human Resource department.

He progressed his technical career in a young and innovative company as leader of Research and Development for fully automated glass facade systems. Subsequently he took his interest in the area of Human Resources as opportunity to retrain and qualified as Communications Trainer as well as completing studies in Personnel Development and Management and as a Career Advisor.

He managed to implement his newly gained knowledge with great aptitude in a large Viennese non profit organisation which specialised in training, coaching and personnel placement. He fulfilled his role as Career Advisor and Coach with great success in both placement and turn over that he was additionally entrusted to take on the responsibility as Team Leader Deputy.

Since 2009 Andreas Lassel is part of the team of ISG-Personnel Placement & Consulting working throughout Austria. The key areas of his responsibilities are in Personnel Advise, Personnel Development and Executive Search.

Numerous clients over a variety of business establishments appreciate to liaise with Andreas Lassel due to his competence, commitment and reliability. His ability of working with dedication, discretion, loyalty and fairness earns him the respect of both business and candidates.

Motto: „When the wind of change is blowing some build walls and others wind mills.“


Mag. Martina Petzl

Managing Partner


Martina Petzl began her professional career after her studies of business management at the University of Graz. After a two-year stint with a marketing agency for tourism in Graz, she began working in the HRM department of the Bundesrechnungszentrum GmbH. Her scope of duties included personnel development, recruiting and personnel marketing as well as media and public relations on the job market.

Furthermore, she was entrusted with designing and implementing various projects for the management board (e.g. HR and FM benchmarks, potential and employee satisfaction analyses, affirmative action plans, re-employment strategies after (maternal) leave, development of workforce compensation plans, re-organisation of personnel administration to SAP).

Before venturing into freelance personnel consultancy, Martina Petzl worked at ORF, the Austrian Broadcasting Corporation, on a comprehensive redesign of ORF’s HR management focusing on the development of “ORF-Recruiting” as the main service entity within the media enterprise.

Due to her highly developed analytical abilities Martina Petzl can quickly master the most difficult problems and situations and conceive the suitable solutions. Her strengths also include a high sense of responsibility, cost and budget consciousness as well as relevant in-depth knowledge and dedication.


  • personnel development, personnel marketing as well as extensive support to businesses in all matters arising from personnel consulting.
  • Analysis of principal tasks and professional and general requirements of a position
  • Advertisement and data base research
  • Structured interviews
  • Research and direct approach
  • Selection assessment centers
  • Presentation of applicants and decision processes
  • Implementation of employee appraisal interview techniques
  • Development centers
  • Design of applicant’s communication
  • Design of advertisements

In the course of a seminar on advertising and sales at Vienna University of Economics, Martina Petzl was able to delve into issues dealing with personnel marketing, corporate culture, corporate identity and design as well as with media and public relations.

Martina Petzl has been a member of ISG since 2002. Due to her personal background in the city of Graz, her main geographical focus is southern Austria therefore offering services to the Styrian business community (computer and IT technologies, pharmaceutical enterprises as well as marketing firms and media).

Motto: A problem is half solved if it is clearly stated.”


Mag. Guido Leissinger

Chief Executive Officer & Founder


After completing his studies at Vienna University of Economics and Business Administration, Guido Leissinger began his professional career in management consultancy. His successful activities included organisational consultancy in many different companies dealing in a variety of commercial fields. Due to his very distinct interest in people, he switched from management to personnel consultancy.


  • Search & selection of specialist workforce and executives
  • HR development
  • Start-up and expansion of companies in Central and Eastern Europe
  • Design and implementation of promotion and selection assessment centers
Thanks to his wide knowledge and his strong sales orientation, he was made departmental manager after a short time. From 1993 to 1999, he successfully led CATRO as general manager being in charge of 60 employees in Austria and the Eastern European subsidiaries.

Guido Leissinger founded ISG in 1999 and has since built up the company from zero to more than 500 people in 23 countries.


  • Personnel consulting
  • HR development
  • Trainings

His leadership style is characterised by the notion that the human being should always be the central focus of all considerations. ISG’s long-term success can only be achieved through teamwork, mutual respect and understanding as well as constant on-the-job training.

Motto: „Success is not a coincidence“


Horst Neumayer

Head of Sales & Recruiting D.A.CH

Universitätsring 14
A-1010 Wien


Während seiner Ausbildung an der IHK in München setzte Horst Neumayer Schwerpunkte im Bereich Marketing und Sales. Seine erworbenen fachlichen Kompetenzen konnte er bei verschiedenen Unternehmen im deutschsprachigen Raum einbringen und erfolgreich umsetzen.
Seit 2008 unterstützt Horst Neumayer das Sales-Team der ISG im Headquater Wien.

Aufgrund seiner jahrelangen Erfahrung und erworbenen fachlichen Expertise wurde ihm 2019 von der Geschäftsführung die operative Verantwortung für den Auf- und Ausbau sowie die Leitung des Sales-Teams DACH und 2022 die Leitung der Recruiting Abteilung übertragen. In der Zusammenarbeit mit seinem Team setzt er auf offene Kommunikation, ein respektvolles Miteinander und stete Weiterentwicklung. Humor ist in seinen Augen ebenfalls ein gern gesehener Begleiter.

Motto: “Es ist nicht genug zu wissen – man muss auch anwenden. Es ist nicht genug zu wollen – man muss auch tun.” – Johann Wolfang von Goethe


Dr. Richard Rudolf

Executive Managing Partner & Head of Industry Sector Group


After receiving a MSc degree in Atmospheric Science and a PhD degree in Experimental Physics from the University of Vienna, Mr. Rudolf joined the Austrian based Stölzle Group, one of the major European manufacturers of primary glass packaging for the pharmaceutical industry.

During the first years at the Stölzle Group Mr. Rudolf managed the business unit Medical, a profit center and commerce business serving universities, hospitals and drug stores with laboratory equipment and specific small scale packaging solutions.

After intermediate career steps as Sales Director Austria & Switzerland and Director of Business Unit Pharma & Medical he finally took over full P&L responsibility as CSO of Business Unit Healthcare & Consumer, covering global sales of Pharma and Consumer packaging containers and solutions to international pharmaceutical accounts in EMEA, CIS, North-America, South-America and APAC.

Having been member of the Executive Director Steering Team of Stölzle Group and member of the board of Stölzle Russia during a substantial period, Mr. Rudolf joined in 2014 Nipro Europe, an essential part of Nipro Corporation based in Japan. In his function as Business Unit Director he steered and organized sales of pharmaceutical primary packaging containers and prefilled syringes made from tubular glass within EMEA.

Combining his passion for the healthcare industry with his long-lasting and thorough senior managerial experience, Mr. Rudolf decided in 2016 to join ISG Healthworld as Global Managing Partner.


  • Executive Search & Selection
  • New Client & Candidate Acquisition on Global Level
  • Recruitment of Professionals, Senior- & C-Level Managers
  • Robust Network within the Pharmaceutical Industry & Market
  • Professional, efficient & effective Cooperation with Clients and Candidates
  • Entrepreneurial Spirit | Passionate & Committed | Well-Organized
  • Wide Angel Business View | Analytic Best-In-Class Approach

Alexander Schaffer

Managing Partner

Universitätsring 14
A-1010 Wien


Mr. Alexander Schaffer has completed his apprenticeship and acquired a certificate of competence as a forwarding agent and a concession for cargo transportation with motor vehicles

In his 40-year career he was, among other things, responsible for the establishment, development, restructuring and reorganization of departments and offices in Austria and abroad. He also expanded forwarding services in Eastern Europe and, for many years, acted as Director and Head of the Eastern Region in well-known forwarding companies.

His activities focused on personnel management, recruiting, training and development and on the advancement of apprentice training (which was awarded a state prize).

In 2018 he took the opportunity to start his own business as a management and personnel consultant, in 2019 he joined the ISG.

Moto: “At the end of the day, it’s THE RESULT that counts.”


Thomas Windhager, B.A.

Executive Managing Partner

Manhartstrasse 1
A-2000 Stockerau


For over 28 years, Thomas Windhager has been working in sales, covering positions from account manager to executive. Correspondingly, he is deeply familiar with the industry and has gained his insight working with national and international companies.

For him, people always are at the center of any corporate activity: from building a new sales team to the strategic positioning a new product. This approach was also central to him when, as a head of sales, he was putting together a sales team for an international manufacturer of office machines.

As founder and managing director of an IT company that acted as general agency for Dictaphone in Austria, he was responsible for sales and marketing agendas.

After his career in the IT industry, he studied Aging Services Management, dealing with demographic change in our society, at Ferdinand Porsche University of Applied Sciences.

His key competences in consulting lie in IT and in recruiting for sales and management positions.

His credo is: “We can only achieve our goals together, taking into account the needs of all parties involved”.


Mag. (FH) Elmar Scheuba

Executive Managing Partner & Global Head of Sector Group "Healthworld"



Europe / EMEA, USA & CANADA, CENTRAL- AND SOUTHAMERICA (LATAM), Asia, Middle- & Far East / U.A.E.


Healthcare private equity and venture capital funds in the range of $50M to $500B AUM / Global Life Sciences, Biotech, Pharma, Medical Devices/Diagnostics, Innovation & Digital Health Transformation / Healthcare Private Equity and Venture Capital backed companies / Privately and public held firms (for-profit) in the range of $10M to $500B / Start-up, Spin Offs, small-, mid- and large-size enterprises, turn-around operations / Multinational Blue chip organizations.


C-Suite & Board Level Search / Board-Level and CEO appointments / Senior Vice President and VP roles / General Management appointments / Senior Directors & Directors / Middle Management Appointments / Engineers / Scientists / Specialists




Commercial Marketing & Sales | Business Development / Health Economics & Market Access | Pricing & Reimbursement / Regulatory Affairs | Quality Management & Safety / Hospital Administration & Management / Medical Assignments / Scientific Research (Biotechnological & Pharmaceutical) / Preclinical & Clinical Development / Medical Manufacturing | Production, Prototyping & OEM / Bioprocessing | Pharmaceutical Engineering & Packaging / Health Care IT Management | Medical- & Bio-Informatics


Mr. Scheuba shows an excellent and unique knowledge of international medical devices, pharmaceutical, biotech and health care markets in general. From his university background perspective, Elmar Scheuba is an international health economist and graduate of “health care management” master studies at International Management Center Krems (IMC) / Austria with the focus on international pharmaceutical management, international hospital management and international health care consulting.

Mr. Scheuba possesses over 20 years of professional work experience during which he has had the opportunity to gain substantial financial health care experience as a global buy side equity analyst for an exclusive health care investment-boutique in Switzerland, where he was responsible for worldwide medical services research (hospitals, distributors, HMO’s, health care IT). During his several professional assignments he could also gain valuable experience in the endovascular medical devices industry at Medtronic Corporation and received an extensive insight in Novartis pharmaceutical Drug Regulatory Affairs (DRA) business. Apart from that, he was later performing as an international product manager for a leading European supplier of consumer medical products and could further contribute to Deloitte’s Life Science consulting business in Zurich where his profound industry expertise and personal dedication made him a valuable asset as a global subject matter expert for topics associated with medical devices, life science, pharma and health care providers.

Prior to setting up his own global recruiting and executive search company Mr. Scheuba was able to successfully build up his strong personal competence in health care recruiting and executive search by performing as a European senior business manager for medical devices and pharma on board of two globally renowned major executive search companies, located in Germany and the UK respectively.

Elmar Scheuba represents a high caliber manager and visionary leader in the following sub-industrial and functional executive search segments:

Covered (Sub-)Industries:

  • Medical Devices, Surgical & Implantology
  • Pharma and Generics
  • Biotechnology, Cell Biology & Life Sciences
  • Medical Capital Equipment & Imaging Technology
  • Medical Diagnostics, Laboratory & Testing
  • Health Care IT, Digital Health & Medical Informatics
  • Dental Medicine & Orthodontology
  • Medical Rehabilitation and Robotics
  • Hospitals and Senior Residences
  • Consumer Healthcare
  • Animal Health and Veterinery Medicine
  • Clinical Nutrition, Clinical Food & Dietary Products
  • Health Insurance & Health Care Finance
  • Chemicals, Fine Chemicals & Specialty Chemicals
  • Cosmetics, Perfumes & FMCG
  • Medical Automation, General Engineering & OEM
  • Micro & Nanotechnology, Material Sciences
  • Sports Medicine & Fitness
  • Health Care Consulting Industry
  • Health Insurance & Health Care Finance
  • Medical Communications & Advertising Industry
  • Health Tourism, Spa & Medical Travel
  • Alternative Medicine, Beauty & Well-Being
  • International Aid & Non-Profit Organizations
  • Medical Professionals

Covered Functions:

  • Commercial Marketing & Sales | Business Development
  • Regulatory, Quality & Safety
  • Market Research & Business Intelligence | Medical Education
  • Scientific Advisory & Medical Education
  • Health Economics & Market Access | Pricing & Reimbursement
  • Scientific Research (Biotech & Pharma)
  • Clinical Discovery & Development
  • Medical Manufacturing, Production & Prototyping
  • Bioprocessing | Pharmaceutical Engineering & Packaging
  • Environmental Health and Safety | Occupational Medicine
  • Hospital Administration & -Management
  • Health Care IT Management & Informatics
  • Medical Controlling & DRG Management
  • Health Consulting & Health Advisory
  • Medical Communications, PR & Advertising
  • Purchasing & Strategic Sourcing
  • Controlling & Finance
  • Logistics & Supply Chain Management
  • Human Resources & Legal
  • Medical Assignments

Representative Search Projects


Dr. Thomas Wladika

Managing Partner

Universitätsring 14
A-1010 Vienna


After completing his doctoral studies in Business Administration (specialization: Banking Management and Trade, SMEs) at the Vienna University of Economics and Business, Dr. Thomas Wladika started his professional career in 1989 with Girozentrale und Bank der österreichischen Sparkassen AG, later GiroCredit (trainee program, subsequently corporate banking).

In 1992, he transitioned to Catro Personalberatung, where he led the financial services division.

After working in corporate customer service for Deutsche Bank in Vienna and Raiffeisenlandesbank Niederöstereich-Wien, as of 2000, he managed a corporate customer profit center for the Bank Austria Group. In 2005, he became deputy head of the Lower Austria (South) and Burgenland region. From 2006, he served as head of corporate customer business in Lower Austria. After serving as a global account manager in the multinational corporate department, he committed himself to strategic tasks and was responsible for a number of global processes and projects in the corporate & investment banking division of Bank Austria until the end of 2017. Afterwards, he joined an acquisition project of Oberbank AG in Vienna.

In addition, Dr. Wladika participated in numerous management, sales, technical and personality development seminars and training courses in Switzerland (Prof. Malik) and Belgium (Management Center Europe). 

Since 10/2018 he is ISG Managing Partner. 

Main focus:

  • Personnel Consulting
  • Search and selection of executives and specialists (advertisements, database and active approach), nationally and internationally
  • Headhunting
  • Sales trainings with focus on acquisition

Motto: “Nothing is more convincing than success”


Mag. Michaela Wessely

Senior Consultant / Prokuristin & Head of Business Consultancy Sector Group


After graduation from the Vienna University of Economics, specializing in human resource management and English, Michaela Wessely started her professional career as consultant with CATRO Personalberatung GmbH.

As a result of her distinct commitment, excellent know-how in several industries and her professional performance the power of attorney was assigned to her.

Covering the same position, she joined the newly founded ISG Personalmanagement GmbH in 1999, where she carried on successfully attending to Austrian and international clients of various industries (production, trade, services, IT and telecommunication). For years, clients and candidates have been appreciating her custom-made, result oriented approach and her confidentiality.


  • Search and selection of candidates
  • Selection of executives and specialists via advertisement, database and direct search nationally and internationally
  • Design and implementation of recruiting and promotion assessment centers
  • Coaching
  • Know-how transfer in an EU-wide project for consultants, HR Managers and CEO in the Ukraine
  • Internal training
Motto: „Continuance is based on change.“

Mag. (FH) Silke Selinger

Managing Partner Consulting & Coaching


Mag. (FH) Silke Selinger berät seit dem Jahr 2007, in Ihrer Funktion als Senior Consultant, renommierte Unternehmen aus den Bereichen Life Science & Health Care.

Ihre exzellente Branchenkenntnis gepaart mit ihrem Zu- und Umgang mit BewerberInnen und ebenso auf Kundenseite machen sie zu einer wertvollen Mitarbeiterin der ISG. Sie überzeugt Kunden sowie Kandidaten mit individuellem Service, Engagement, persönlicher Wertschätzung und absoluter Diskretion. Kunden schätzen besonders ihre hervorragende Branchenkompetenz, ihr hohes Maß an Pflichtbewusstsein und Projektverantwortung, persönlichen Einsatz und ihre Fähigkeit Aufgabenstellungen und Situationen rasch zu erfassen und die richtigen Lösungsansätze zu konzipieren.

Sie ist Absolventin mit ausgezeichnetem Erfolg des berufsbegleitenden Master Studiums „Health Management“ am International Management Center Krems (IMC) und spezialisierte sich auf die Bereiche Pharmamanagement, Krankenhausmanagement und Int. Health Consulting.

Zudem ist sie ISO-zertifiziert als systemischer Personal- & Businesscoach. Zur weiteren Vertiefung hat Frau Selinger den akademischen Universitätslehrgang „Psychosoziale Beratung“ an der Sigmund Freud Privatuniversität mit ausgezeichneten Erfolg abgeschlossen.

Ihr Motto:
„Energy flows, where the attention goes.“ (Milton Erickson)


Oliver Messner, MSc

Managing Partner


Oliver Messner brings extensive experience in the entire field of sustainable corporate management. Through his long-term roles in international technical sales and as Managing Director of Technology & After Sales, he was able to build comprehensive know-how in quality management, combined with continuous efficiency improvement. This led him to increasingly focus on the full scope of sustainability management. With his expertise, Oliver Messner is among the leading experts when it comes to the establishment, implementation, and permanent integration of ESG measures in companies. As a sought-after keynote speaker, he imparts his knowledge at conferences and other lecture formats. He is regularly booked by various industry representatives and companies to conduct impulse lectures, workshops, and trainings. Furthermore, he teaches in Austria and Germany at various universities on topics such as climate change, sustainability/ESG, CSRD/ESRS, supply chain management, carbon accounting, sustainability reporting, sustainable (strategic) corporate leadership and development, and more.

In his MSc studies in Applied Business Management, he focused on strategic corporate and organizational development, leadership and human resource management, and innovation management. Through his training as a climate & system dynamist at MIT (in conjunction with Climate Interactive), Oliver Messner is also a certified MIT climate ambassador and En-ROADS consultant. Furthermore, he has successfully completed training as a Sustainable Business Transformation Manager and HRM-Green-Manager. In addition, he is an ISO-certified climate protection officer, environmental management officer + auditor (14001), energy management officer + auditor (ISO 50001 + 50002/EN 16247).

With his years of experience in sustainability management, international project management, sales & after-sales, and personnel and corporate management, he now supports as Managing Partner of ISG Personalmanagement GmbH & Head of Division ISG Green companies so that they can continue to develop successfully both economically and sustainably.


  • Green HR-Management & Green-Recruiting
  • Executive Search for industry and sustainability experts
  • Recruiting (search & selection)
  • Strategic Human Resource Management
  • Derivation and implementation of ESG measures & criteria
  • Development of tailor-made ESG strategies
  • Integration of SDGs (Sustainable Development Goals)
  • CSRD/ESRS including sustainability reporting
  • Corporate carbon accounting (Scope 1-3)
  • Site analysis (ESG maturity modeling)
  • Climate risk analysis
  • Stakeholder analysis
  • Materiality analysis (double materiality)
  • Energy and environmental management
  • Personnel development (training, workshops)
  • Innovation and transformation management
  • Interim management

Company sizes:

  • Start-ups | SMEs | Corporations

Industry expertise:

Industry | Technology | Manufacturing | Pharmaceutical Industry + Healthworld | Automotive | FMCG + Trade | Financing | Business Consultancy | Scientific Institutions | Construction & Design


  • Passion for working with people
  • Individual and tailor-made consultation
  • Uncomplicated communication at eye level
  • Visionary thinking • Entrepreneurial mindset
  • Above-average commitment
  • Competence and professionalism in action
  • Hands-on mentality
  • Excellent network at all levels and hierarchy levels

His motto: “Sustainable corporate development is no accident – it is the result of decisions”

Let’s shape the future of your company today.

I look forward to it!


Dr. Peter Muckenhuber

Managing Partner


Dr. Peter Muckenhuber completed his degree in production and management at the Steyr University of Applied Sciences in 2002, followed by part-time studies in economics at the Johannes Kepler University and doctorate at the University of Natural Resources and Applied Life Sciences in Vienna.

With almost 20 years of professional experience the range of track record of Dr. Muckenhuber lasts from project experience to leadership experience as team and branch manager as well as interim manager. The professional experience covers manufacturing and industry, agriculture, energy supply, technical services / IT / robotics and mechanical engineering.

The individual needs of customers and their organizations are met through the broad experience of Dr. Muckenhuber identified efficiently and precisely and enables a holistic view of it. Thanks to the extensive service portfolio (personnel, IT special service, headhunting, training, outplacement, interim management), the right solution for customers, employees and potential new employees can be developed and implemented.


Credo: „The Only Thing That Is Constant Is Change“ (Heraklit)



  • Technology
  • Industry
  • Business Consultancy / Interim management
  • Public & Government (Energy)
  • Agriculture

Gerald M. Nitsche

Managing Partner


Gerald Nitsche has many years of experience in major account management in direct and indirect IT solution sales. He has an excellent network in the IT environment, primarily in the finance and insurance sector as well as in the public sector, and provides in-depth knowledge of the specific requirements for employees in these industries.

Gerald has more than 30 years of experience in the IT sector as a sales manager, senior account manager and key account manager in national and international companies.

Based on his experience in leadership, he can identify if the candidate matches with the new area of responsibility and the team.


Barbara Sebera (formerly Rammer)

Managing Partner


Barbara Sebera – active in personnel consulting for over 30 years.

After completing a Commercial Academy, Barbara began her career working in sales and controlling for a food industry company in Vienna for five years. She then moved in the field of personnel consulting and recruitment in 1990. Since then, Barbara has been working in the personnel consulting and recruitment business for well-known companies in Upper Austria. Over the last 16 years she was a division manager for commercial and technical positions.

With ISG since January 1st, 2021 as Managing Partner.

Barbara Sebera has extensive professional experience in the classic field of search & selection of Specialists and Executives in various industries. This includes Executive recruitment and guarantees professional handling and support throughout the consulting and recruitment process.

Barbara has completed numerous training courses in the areas of leadership, communication, sales and training as a systemic solution-oriented coach throughout her professional career.

In addition to systemic search and selection as well as analytical selection, Barbara Sebera is a successful personal consultant and recruitment professional today as she provides above all empathy, communications skills, hands-on mentality, absolute reliability and confidentiality which customers and candidates hold in high regard and value.


  • Professional Search & Selection
  • Executive Search
  • Coaching
  • Outplacement


  • Industry & Consumer Goods
  • Retail & Wholesale
  • Financial Services
  • Transportation & Logistics
  • Consulting Services

Mag. Verena Mollner

Managing Partner


After graduating in Business Education with a specialization in Transport and Logistics Verena Mollner started her career in the purchasing for CEE in fashion retail.

Due to her interest in working with people and their personnel development she continued her career in different HR-roles – always with a focus on recruiting. With her experience in various industries (e.g. manufacturing industry, media, logistics, retail) Verena Mollner supports companies from different branches and sectors with tailor-made recruitment solutions.


Focus areas of work:

  • personnel search and selection for experts and executives
  • development of assessment center
  • competence and potential analysis
  • out- and newplacement consulting

Motto: “Knowing is not enough – we have to apply. Willing is not enough – we have to do.” ~Johann Wolfang von Goethe


Chunxia Kuang


+86 138 2937 0556
WeChat ID: 13829370556


Chunxia Kuang has extensive experience in telecommunications in the Chinese market, where she was responsible for sales, marketing, and the expansion/rollout of broadband services.  In addition, she gained valuable experience working for a provider of mobile solutions and the marketing of services. Mrs. Kuang has an extensive knowledge of the Chinese market, speaks Chinese and German and will be part of the team working on the expansion to China.


Yuwei Bao


Wechat ID: Fupo_Yw


Yuwei Bao has been studying languages for several years and has focused herself on the German language, collecting extensive experience in the areas of business assistance, translation, interpreting and international business correspondence. In addition, she has been working as a German teacher. Besides Chinese and German, she is fluent in English and will be part of the team working on the expansion to China.


Manuel Major

Deputy Head of Sales & Recruiting D.A.CH

Universitätsring 14
A-1010 Wien


Manuel Major ist seit 2022 bei der ISG als Deputy Head of Sales & Recruiting der D.A.CH-Region tätig.

Im Anschluss an seine Matura an der AHS De La Salle in Wien hat er seinen Präsenzdienst abgeleistet. Als Sportler gilt seine Begeisterung dem Fußball – die Fähigkeit als Teamplayer zu agieren, bringt er auch bestens in seinem neuen Aufgabenbereich bei der ISG ein.

Manuel hat durch seine fundierte, wissenschaftliche Ausbildung und seinen beruflichen Werdegang mit Stationen im öffentlichen Dienst sowie im HR-Consulting seine Leidenschaft, Menschen zu begegnen, zum Beruf gemacht.

Motto: “Wer aufhört zu lernen, ist alt. Er mag zwanzig oder achtzig sein.” (Henry Ford)


Mag. (FH) Sonja Schmid, MA

Managing Partner


Sonja Schmid studierte Exportmanagement und internationales Weinmarketing mit den Schwerpunkten interkulturelles Management, Organizational Behavior und Team Entwicklung.

Sie verfügt über mehr als zwanzig Jahre Erfahrung in Marketing, Kommunikation, Produktentwicklung und Verkauf im Bereich Lebens- und Genussmittel, davon zehn Jahre im Management und als Führungskraft. Ihre Kompetenzen und Fertigkeiten für Prozessmanagement, Organisation und Kommunikation vertiefte Sie im Rahmen von Merger&Acquisition Projekten. Veränderungsprozesse in Unternehmen gestaltete sie mit bei Unternehmenszusammenführungen, Systemumstellungen, Standortschließung und Neuorganisation von Abteilungen und Teams.

Bei der ISG hat Frau Schmid ihre besondere Leidenschaft für die Verbindung von Unternehmensinteressen mit den dahinterstehenden Menschen zum Beruf gemacht. Seit 2022 ist Sonja Schmid Teil des ISG Teams in Krems an der Donau.



  • Personalberatung – Suche und Auswahl von Fachspezialisten und Führungskräften
  • Executive Search & Direktansprache (Head Hunting)
  • Online Jobinserate auf nationalen und internationalen Plattformen
  • Lösungsorientierte Kundenberatung
  • Karriereberatung


Motto: „Stay committed in your decisions but stay flexible in your approach.“  (Tony Robbins)


Mag. Melanie Helm

Managing Partner


Melanie Helm graduated from Vienna University of Economics and Business (WU Wien) with a [master`s degree specializing in integrated corporate accounting]. Afterwards she started her professional career in the field of strategic HR management working for the Federal government. In that role she assumed numerous reporting tasks focusing on collaboration and key figure-based development of the various HR-areas. From her years of experience, she gained valuable, cross-sector knowledge and expertise in the financial sector. In addition, since 2012 Melanie Helm has been teaching business classes in the adult education sector.

Her motto is: „Where the focus geos energy flows”

Melanie Helm joined the ISG-Team in 2022 bringing forth her goal-oriented, focused way of approaching complex challenges and as Managing Partner is responsible for

  • Personnel consulting
  • Personnel search and selection
  • Direct approach & database search
  • Design and implementation of testing

David Haidvogl



David Haidvogl ist seit 2022 bei der ISG Personalmanagement GmbH als Recruiter tätig.

Zurzeit befindet er sich im sechsten Semester seines Bachelorstudiums der Wirtschafts- und Sozialwissenschaften an der Wirtschaftsuniversität Wien. Sein Fokus liegt auf den Bereichen Human Ressource Management sowie Rechnungslegung und Steuerlehre.

Als sportaffiner Mensch verbringt David seine Freizeit am liebsten in der Natur.

Motto: „Wer will, findet Wege, wer nicht will, findet Gründe“


Michael Korzinek, BSc



Michael Korzinek ist seit 2022 bei der ISG Personalmanagement GmbH als Recruiter tätig.

Während seines Bachelorstudiums der Wirtschafts- und Sozialwissenschaften, Schwerpunkt BWL, hat er seine Begeisterung für den HR-Bereich entdeckt. Daher war es für Michael naheliegend, neben seinem aktuellen Masterstudium der Wirtschaftspädagogik, die Tätigkeit als Recruiter bei der ISG aufzunehmen.

Erste Berufserfahrungen konnte er unter anderem im Rahmen von Praktika beim Rechnungshof sowie bei der Uniqa sammeln.

Begleitend zu seiner beruflichen Tätigkeit wird Sport bei Michael großgeschrieben. Daher ist es ihm auch möglich, die im Sport notwendige Disziplin und den Teamgeist in seinem Aufgabenbereich optimal umzusetzen.

Motto: „Set your goals high and don’t stop till you get there“ – Bo Jackson


Mag. Thomas Weninger

Media Consultant


Nach Jahren als selbständiger Grafikdesigner und freiberuflicher Zusammenarbeit mit der ISG bringt Mag. Thomas Weninger seine Erfahrungen nun als Media Consultant / Grafiker in unserem Unternehmen ein. Im vergangenen Jahr kam noch eine Ausbildung als zertifizierter User Experience Designer dazu.

Die Schwerpunkte seiner Tätigkeit sind:

  • Interner Ansprechpartner für Berater*innen
  • Anlage der Inserate im ISG internen System
  • Gestaltung der Inserate für online und print

Natalia Jamernik



Natalia studied Business Management in London, where she specialised in Human Resource Management. After acquiring some HR experience in London and graduating she decided to come back to Austria. Shortly after Natalia was hired by ISG as a Recruitment intern, where she grew further admiration for recruiting. She was responsible for assisting her senior in hiring for various branches and her tasks included telephone screenings, interviews, as well as data base and social media head hunting. Here Natalia realised her passion for head hunting. She is currently working as a Researcher in the Executive Search team in ISG.

Motto: “You only live once


Sandra Mahrhofer

Managing Partner


Sandra Mahrhofer completed her master’s degree in business administration with a focus on human resource management and recruiting as well as human resources and organisational development at the FH Wiener Neustadt.

Already during her studies, Ms. Mahrhofer discovered her great passion for human resources consulting.

The human resource is becoming increasingly important for companies. Skilled workers are in demand, and the selection of the right employees is a decisive factor for the success of a company. However, not only HR consulting, but all HR-related topics are of enormous importance for companies if they want to remain competitive.

Sandra Mahrhofer has sound knowledge of this at the most up-to-date level and is pleased to be able to support companies in Austria & Germany.


Theresa Hierwek, BA



Theresa Hierwek absolvierte ein betriebswirtschaftliches Studium. Durch ihr großes Interesse an der Arbeit mit Menschen fand ihren Berufseinstieg in der Personalberatung.

Seit 2019 arbeitet sie als Consultant im Healthcare Bereich und unterstützt in einem erfolgreichen Team Pharma- und Medizintechnikunternehmen bei der Suche und Auswahl passender KandidatInnen für unterschiedliche Funktionen.


Angela Exenschläger

Junior Consultant


Angela Exenschläger absolvierte ihr Bachelorstudium mit Fokus auf Internationale Betriebswirtschaft an der Wirtschaftsuniversität Wien. In ihrem laufenden Masterstudium an der Universität Wien spezialisiert sie sich auf den Bereich Organization & Personnel.

Ihren Berufsweg in der ISG startete sie Anfang 2021 als Praktikantin im IT-Recruiting. Seit September 2021 arbeitet sie als Junior Consultant im Team von Birgit Prochazka und unterstützt Unternehmen im Healthcare-Bereich bei der Suche und Auswahl passender KandidatInnen in verschiedenen Funktionen.


Dipl.Ing. Herwig Tretter, MBA

Managing Partner


Herwig Tretter ist Agraringenieur und MBA, Schwerpunkt Marketing.
Er hat vielfältige Führungs-, Vertriebs-, und Auslanderfahrung in folgenden Branchen:

  • Maschinen- und Gerätebau
  • Landtechnik
  • Möbelindustrie und Inneneinrichtungen
  • Land- und Forstwirtschaft, Gartenbau
  • Groß- und Einzelhandel

Diese Erfahrung wurde folgendermaßen erworben:

  • Als Exportleiter von Landtechnik in Spanien, Portugal, Lateinamerika und die Karibik (Rudolf Bauer AG und Ing. Waldhauser Maschinenfabrik)
  • Als Stv. Generaldirektor in einem Joint Venture in Kiew zwischen Minolta Austria und dem Ukrainischen Handelsministerium
  • Als Geschäftsführer von Electrolux Systemtechnik (Marktführer in Österreich im Bereich Großküchen, Wäschereitechnik)
  • Als Geschäftsführer und später Vorstand von Umdasch Ladenbau (Big Player in dieser Branche in Europa) mit Niederlassungen in Deutschland, Schweiz und Italien
  • Als selbständiger Unternehmer 15 Jahre in Ostafrika – Sanierung und Betrieb von 4 Fair-Trade Schnittrosenfarmen

In allen Tätigkeiten hat sich Herr Tretter auch teilweise intensiv mit Personalfragen und Recruiting, Head Huntig befaßt.


Mathias Rieger



Mathias Rieger ist seit 2022 bei der ISG Personalmanagement tätig. Während seines Bachelorstudiums auf der Wirtschaftsuniversität Wien, mit einem Schwerpunkt auf Betriebswirtschaftslehre, hat er seine Begeisterung für den HR-Bereich entdeckt! Sein Masterstudium mit einem Schwerpunkt auf Sozioökonomie wird er im Herbst 2023 beginnen. Dadurch wird er sich einen ganzheitlichen Blick auf die Verflechtungen von Wirtschaft und Gesellschaft verschaffen und optimal für zukünftige Herausforderungen gerüstet sein!

Bis zu seinem zweiundzwanzigsten Lebensjahr war Mathias Rieger als Handballer und somit als Profisportler in ganz Österreich im Einsatz. Diese Zeit als Leistungssportler lehrte ihm wertvolle Lektionen und formten seinen Charakter. Die Tugendenden, welche er im Laufe seiner sportlichen Karriere erlernt hat, helfen ihm nun auch in seiner Position als Recruiter.

Motto: “Hard work beats talent when talent doesn’t work hard” – Tim Notke


Alexander Rauchwarter



Alexander Rauchwarter ist seit 2023 bei der ISG Personalmanagement GmbH als Recruiter tätig.

Momentan studiert er Wirtschafts- und Sozialwissenschaften an der Wirtschaftsuniversität Wien und hat im Rahmen dessen den Bereich Human Resources für sich entdeckt. Demzufolge hat er sich auf Personalmanagement und Wirtschaftstraining & Bildungsmanagement spezialisiert und sich dafür entschieden, beruflich in diese Richtung zu gehen.

In seiner Freizeit spielt er seit vielen Jahren Fußball und Tennis.

Motto: „Gib das, was dir wichtig ist, niemals auf, nur weil es nicht einfach ist.“ (Albert Einstein)