How many movies have Karen Rosenfelt and Ross Bagdasarian, Jr. collaborated on?

They have worked on 4 movies together! Their first movie together was Alvin and the Chipmunks (2007) while their highest rated movie together was Alvin and the Chipmunks: The Road Chip (2015). They have not worked together since Alvin and the Chipmunks: The Road Chip (2015). They are most known for their animation films together.