30 Years at the forefront of energy and climate solutions
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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.

Manon Janssen,

Manon Janssen, CEO (c) Ecofys


Kees van der Leun,

Kees van der Leun


Joris de Groot,

Joris de Groot


Kornelis Blok,
Director of Science

Kornelis Blok


Anja de Jong,
Finance Director

Anja de Jong



Joop Oude Lohuis,
Client Director

Joop Oude Lohuis


Ria Oonk,
Client Director

Ria Oonk