How many movies have Kathy MacKay and William R. Moses collaborated on?

They have worked on 3 movies together! Their first movie together was Perry Mason: The Case of the Glass Coffin (1991) while their highest rated movie together was Perry Mason: The Case of the Fatal Fashion (1991). They have not worked together since Perry Mason: The Case of the Fatal Framing (1992). They are most known for their drama films together.