How many movies have Gene Callahan and Roger M. Rothstein collaborated on?

They have worked on 5 movies together! Their first movie together was Harvey Middleman, Fireman (1965) while their highest rated movie together was The Effect of Gamma Rays on Man-in-the-Moon Marigolds (1972). They have not worked together since Seems Like Old Times (1980). They are most known for their drama films together.