How many movies have Roland Reber and Wolfgang Seidenberg collaborated on?

They have worked on 4 movies together! Their first movie together was Mein Traum oder die Einsamkeit ist nie allein (2008) while their highest rated movie together was Roland Reber's Cabaret of Death (2019). They have not worked together since Roland Reber's Cabaret of Death (2019). They are most known for their drama films together.