How many movies have George Eckstein and Reuben Cannon collaborated on?

They have worked on 3 movies together! Their first movie together was Perry Mason: The Case of the Musical Murder (1989) while their highest rated movie together was Perry Mason: The Case of the Poisoned Pen (1990). They have not worked together since Perry Mason: The Case of the Desperate Deception (1990). They are most known for their tv movie films together.