How many movies have Matt Groening and Pamela Hayden collaborated on?

They have worked on 4 movies together! Their first movie together was The Simpsons: Treehouse of Horror (2002) while their highest rated movie together was The Simpsons Movie (2007). They have not worked together since The Simpsons: O C'mon All Ye Faithful (2024). They are most known for their comedy films together.