How many movies have Hubert Bartholomae and Sonja B. Zimmer collaborated on?

They have worked on 3 movies together! Their first movie together was Ghost Chase (1987) while their highest rated movie together was Lilly the Witch: The Journey to Mandolan (2011). They have not worked together since Lilly the Witch: The Journey to Mandolan (2011). They are most known for their science fiction films together.