How many movies have Gail Joyce Fortmuller and Rosanne Bigelow collaborated on?

They have worked on 12 movies together! Their first movie together was Perry Mason: The Case of the Lethal Lesson (1989) while their highest rated movie together was Perry Mason: The Case of the Silenced Singer (1990). They have not worked together since Ladybugs (1992). They are most known for their crime films together.