Until 2010, Willem held policy and programming positions, mostly within the United Nations system. Since then he has worked as an independent evaluator for the international development and humanitarian sectors. He specialises in organisational performance assessments and donor portfolio reviews with values of £500 million and above. In addition to his consultancy work and role at the University of Birmingham, Willem holds occasional NGO trusteeship positions and co-owns Green Visions, the Balkans’ liveliest adventure tourism company. He also serves as an academic editor for Wiley and is a Senior Fellow at Agulhas Applied Knowledge and Associate Director at the Humanitarian Impact Institute. Willem authored two recent books in the Routledge’s “Rethinking Development” series, as well as books such a few travel guides, Bloomsbury’s “100 ideas for dads who love their kids but find them exhausting”, and the upcoming “Very Official Book of Hugs”.