How many movies have Bertha Spieker and Giselher Venzke collaborated on?

They have worked on 4 movies together! Their first movie together was Endloser Horizont (2006) while their highest rated movie together was Northmen: A Viking Saga (2014). They have not worked together since Jana und der Buschpilot - Einsame Entscheidung (2015). They are most known for their drama films together.