How many movies have David P. Harmon and Lloyd J. Schwartz collaborated on?

They have worked on 2 movies together! Their first movie together was Rescue from Gilligan's Island (1978) while their highest rated movie together was The Harlem Globetrotters on Gilligan's Island (1981). They have not worked together since The Harlem Globetrotters on Gilligan's Island (1981).