How many movies have Gerhard Hahn and Jens Busch collaborated on?

They have worked on 8 movies together! Their first movie together was Werner - Volles Rooäää!!! (1999) while their highest rated movie together was The Fairy Tales of the Brothers Grimm: Sleeping Beauty / The Two Princesses (2005). They have not worked together since The Fairy Tales of the Brothers Grimm: The Six Swans / The Devil's Three Golden Hairs (2006). They are most known for their animation films together.