How many movies have Ernst Rennspies and Hanns Heinz Ewers collaborated on?

They have worked on 1 movie together! Their first movie together was Alraune, die Henkerstochter, genannt die rote Hanne (1918) and was their highest rated movie together. They have not worked together since Alraune, die Henkerstochter, genannt die rote Hanne (1918).