How many movies have Neal Hefti and Richard Quine collaborated on?

They have worked on 4 movies together! Their first movie together was Sex and the Single Girl (1964) while their highest rated movie together was Synanon (1965). They have not worked together since Oh Dad, Poor Dad, Mamma's Hung You in the Closet and I'm Feeling So Sad (1967). They are most known for their comedy films together.