Our executive management

Ecofys is a key player in sustainable energy solutions and climate change issues. Profound knowledge, innovation and dedication are what drive our daily work. These ambitions and skills are reflected in our Executive Management team.

Management Team

Thijs Aarten

Management Team

Thijs Aarten is interim Managing Director at Ecofys. He has over 33 years of energy industry experience, having worked i...

Kornelis Blok

Management Team

Kornelis Blok(1956) has a background in physics and received a Ph.D. degree from Utrecht University for his thesis ‘On t...

Kees van der Leun

Management Team

Kees van der Leun (1960) graduated from Utrecht University with an MSc in Physics in 1986. He joined Ecofys as its third...

Ria Oonk

Management Team

Ria Oonk (1967) is Managing Partner at Ecofys. After graduating in European Studies at the University of Amsterdam, Ria ...

Carsten Petersdorff

Management Team

Dipl.-Phys. Carsten Petersdorff (1970) is Managing Partner of Ecofys and responsible for the business area Urban Energy....

Joris de Groot

Management Team

Joris de Groot is Managing Partner at Ecofys. Before joining Ecofys in 2014, he gathered broad management consulting exp...

Daniel Becker

Management Team

Daniel Becker is Managing Partner at Ecofys. He is an expert on international market conditions and support schemes for ...

Katja Eisbrenner

Management Team

Katja Eisbrenner is Managing Partner at Ecofys. She has 10 years of international experience in project management and c...

Michiel Müller

Management Team

Michiel Müller (1963) is Managing Partner at Ecofys and Managing Director of Ecofys Wind Turbine Testing Services (WTTS)...

Anja de Jong

Management Team

Anja de Jong is Finance Director and responsible for Finance, ICT and legal. She joined Ecofys in September 2013. Anja h...

Izaak van der Neut

Management Team

Izaäk van der Neut is HR manager for Ecofys. He joined Ecofys in 2011 and is responsible for our human capital strategy,...

Mariëlle Vosbeek

Management Team

Mariëlle Vosbeek is Marketing & Communication manager at Ecofys since 2011. Since September 2015, she is Managing Partne...