How many movies have E.M. Kevke and Ray Dennis Steckler collaborated on?

They have worked on 3 movies together! Their first movie together was The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies!!? (1964) while their highest rated movie together was Lemon Grove Kids Meet the Monsters (1968). They have not worked together since Sinthia: The Devil's Doll (1970). They are most known for their horror films together.