How many movies have Kathleen Warners and Pieter Bouwman collaborated on?

They have worked on 3 movies together! Their first movie together was Micha Wertheim: Voor Beginners (2006) while their highest rated movie together was Micha Wertheim: Voor Gevorderden (2008). They have not worked together since Pieter Verelst: Mijn Broer en Ik (2019). They are most known for their comedy films together.