How many movies have Julian Koberman and Maarten de Groot collaborated on?

They have worked on 2 movies together! Their first movie together was From Dusk Till Dawn 2: Texas Blood Money (1999) while their highest rated movie together was Starship Troopers 3: Marauder (2008). They have not worked together since Starship Troopers 3: Marauder (2008).