How many movies have Norm Silver and Paul Staheli collaborated on?

They have worked on 4 movies together! Their first movie together was Perry Mason: The Case of the Silenced Singer (1990) 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 Skin-Deep Scandal (1993). They are most known for their tv movie films together.