How many movies have Herbert Kretzmer and Otto Heller collaborated on?

They have worked on 2 movies together! Their first movie together was Too Hot to Handle (1960) while their highest rated movie together was Can Heironymus Merkin Ever Forget Mercy Humppe and Find True Happiness? (1969). They have not worked together since Can Heironymus Merkin Ever Forget Mercy Humppe and Find True Happiness? (1969).