How many movies have Ray Dennis Steckler and Robert Silliphant collaborated on?

They have worked on 1 movie together! Their first movie together was The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies!!? (1964) and was their highest rated movie together. They have not worked together since The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies!!? (1964).