How many movies have David Tart and Roger S.H. Schulman collaborated on?

They have worked on 3 movies together! Their first movie together was Unstable Fables: 3 Pigs and a Baby (2008) and was their highest rated movie together. They have not worked together since Unstable Fables: Goldilocks and the Three Bears (2010). They are most known for their animation films together.