How many movies have Erle Stanley Gardner and Gary Grillo collaborated on?

They have worked on 19 movies together! Their first movie together was Perry Mason: The Case of the Scandalous Scoundrel (1987) 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.