How many movies have Jan Fedder and Markus Trebitsch collaborated on?

They have worked on 4 movies together! Their first movie together was Die Zürcher Verlobung - Drehbuch zur Liebe (2007) and was their highest rated movie together. They have not worked together since Der Hafenpastor und das Blaue vom Himmel (2016). They are most known for their drama films together.