Who we are

Thyra de Graaff

Thyra conducts board reviews. She advises leaders on governance matters and board dynamics. She provides coaching and role consultation to (non)-executives directors and leaders who want to reflect on their performance.

Email: thyra.degraaff@phyleon.com

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As a consultant, she has 30 years of experience working on organisational change and transition, executive coaching, board development, role consultation and team development. She inspires leaders to reflect on their responsibilities, their roles and their interactions with individual employees, teams and organisations. As an executive coach (individual and teamlevel) for Insead Global Leadership Centre (IGLC), her practice also includes coaching supervisory board members in the Inboard Leadership Program for Insead alumni and coaching, supervising in Insead’s international postgraduate Executive Master in Change Program.

Thyra has a Master’s degree in Work and Organisational Psychology at Leiden University and has a Master’s degree in Business Administration at Rotterdam School of Management, Erasmus Universiteit. Thyra is a licensed psychotherapist.


International Society for Psychoanalytic Study of Organisations (ISPSO)
Dutch Institute of Psychologists

Erik van de Loo

Erik van de Loo is specialised in fundamental change processes in organisations, culture and leadership. He advises national and multinational organisations on the interrelated change processes on individual, team and organisational level and is professor at different international institutions.

Email: erik.vandeloo@phyleon.com

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Academic career:

  • Professor of Organizational Behaviour at INSEAD and Co-Founder and Co-Director of the post-graduate programme “The Executive Master in Change. Transforming self and organisations”
  • Professor of Leadership and Behaviour at TIAS School for Business and Society at Tilburg University
  • Former Professor at UniRazak University in Kuala Lumpur and the Vrije Universiteit Amsterdam

Erik studied Clinical Psychology at the Radboud University Nijmegen and received his PhD at the Leiden University. He is a psychoanalyst with a Masters’ degree in Work & Organisation in Occupational Health (SIOO). Erik published several articles on topics such as clinical approach to coaching and consultation, organizational change and leadership, corporate governance and boards. His current research focuses on Board Leadership and Board Dynamics, exploring the interaction between Boards of Executives and Non-Executives in their roles at the top of the organisation.

Monitoring Committee Accountancy (since 2015), overlooking changes and transformations in the accountancy practice in the Netherlands
International Society for Psychoanalytic Study of Organisations

Erik van de Loo publishes regularly. A list of his most recent publications is here

Jaap Winter

Jaap conducts board reviews, advises boards and leaders on governance matters and board dynamics. Jaap is one of Europe’s leading corporate governance experts. He was member of the Tabaksblat Committee that drafted the first Dutch Corporate Governance Code in 2003. He chaired the High Level Group of Company Law Experts that advised the EU Commission on Corporate Law and Corporate Governance in the EU in 2001-2002. He has advised boards and executive and non-executive directors extensively on corporate law, corporate governance and M&A.

Email: jaap.winter@phyleon.com

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Jaap was President of the Executive Board of the Vrije Universiteit Amsterdam from December 2013 until December 2017. Before that, he was partner of the Amsterdam based law firm De Brauw Blackstone Westbroek.

Academic career:

  • Professor of International Company Law at the University of Amsterdam
  • Professor of Corporate Law, Governance and Behaviour at the Vrije Universiteit Amsterdam
  • Former Distinguished Visiting Professor of Corporate Governance at INSEAD

Jaap is chairman of the Supervisory Board of the Van Gogh Museum and chairman of the Supervisory Board of Erasmus University.


  • ICGN Award for exceptional achievement in the field of corporate governance in 2004
  • The Gouden Zandloper Life Time Achievement Award in 2019 for his work as a lawyer

Jaap Winter publishes regularly. Click here for the list of his most recent publications

Pelle Engel

Pelle Engel performs board reviews and advises boards of executive and non-executive directors on governance and board leadership. He has gained profound experience in advising and supporting directors in both the Executive Board and the Supervisory Board of ABN AMRO Bank. In addition, he has many years of professional experience in advising companies on financial and strategic issues and in leading teams in different and rapidly changing environments. With responsible roles in Sales, Risk Management, Strategy and Corporate Governance, Pelle has built up a wide range of expertise and skills that strengthen his natural role as a trusted advisor.

Email: pelle.engel@phyleon.com

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Pelle Engel has a Masters’ degree in Economics at the University of Amsterdam (UvA), is a post academic trained business mediator at the Amsterdam Appropriate Dispute Resolution Institute (ADR) and is now completing his Executive Master in Change at INSEAD.

Marjorie van de Wolfshaar

Marjorie is a professional in the field of Personal Assistance and Executive Support, with more than 20 years of experience working at Supervisory and Executive Board level. She enables the day-to-day management routines that enhance the effectiveness of both Erik van de Loo and Jaap Winter in particular and the organization as a whole.

Email: marjorie.vandewolfshaar@phyleon.com

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  • IMA International Management Assistants
  • Member of the Board Stichting Sporttop

Inge van der Meys

Inge is a driven office manager with organizational skills, with broad experience in the field of commercial, operational and facility management. She enables the day-to-day management routines that enhance the effectiveness of both Thyra de Graaf and Els Kroonenberg-Boonacker in particular and deals with the daily office routine.

Email: inge.vandermeys@phyleon.com

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