How many movies have Dean Hargrove and Erle Stanley Gardner collaborated on?

They have worked on 30 movies together! Their first movie together was Perry Mason Returns (1985) while their highest rated movie together was Perry Mason: The Case of the Heartbroken Bride (1992). They have not worked together since Perry Mason: The Case of the Jealous Jokester (1995). They are most known for their crime films together.