How many movies have Eileen Horta and William R. Moses collaborated on?

They have worked on 10 movies together! Their first movie together was Perry Mason: The Case of the All-Star Assassin (1989) while their highest rated movie together was Perry Mason: The Case of the Glass Coffin (1991). They have not worked together since Perry Mason: The Case of the Fatal Framing (1992). They are most known for their crime films together.