Our Dedicated & Talented Team

Different generations and a variety of specialties. 

Meet the real faces and let us start a new game adventure

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Jaap van Muijen

The senior psychologist in serious leadership games.

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Another talented assessment psychologist who easily turns into an actor.

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Patrick Spekman

The actor who switches between serious roles & cabaret.

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Wessel van Arnhem

Chief of the student pool.

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Lars van den Brand

Video magician.

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Gert-Jan van Arnhem

A lifetime dedicated partner of 4Challenge.

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Michelle Witsenburg

The assessment psychologist participating in gamified assessments.

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The chameleon switching between professional trainer and actor.

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Max Brouwer

The brilliant & charming gamemanager.

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Ruben Uyterlinde

Data woozle. (reports)

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Matunda Groenendijk

Audio-visual artist. 

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Margreet Uyterlinde

Founder of 4Challenge 

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Marga de Groot

The psychologist you also meet in gamified assessments.

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Koen Franse

The actor you don't want to meet when he is not happy.

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Wessel van Arnhem

The (online) teacher every kid wants.

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Marieke van Arnhem

Spider in the web.

(technical support)

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Juul van Arnhem

Stylist to make it all a bit more beautiful.