How many movies have George Lucas and Trisha Biggar collaborated on?

They have worked on 7 movies together! Their first movie together was The Adventures of Young Indiana Jones: Treasure of the Peacock's Eye (2002) while their highest rated movie together was Star Wars: Episode III - Revenge of the Sith (2005). They have not worked together since Star Wars: Episode III - Revenge of the Sith (2005). They are most known for their action films together.