How many movies have John Viener and Sue Perrotto collaborated on?

They have worked on 4 movies together! Their first movie together was Phineas and Ferb The Movie: Across the 2nd Dimension (2011) while their highest rated movie together was Phineas and Ferb: Night of the Living Pharmacists (2014). They have not worked together since Phineas and Ferb: Night of the Living Pharmacists (2014). They are most known for their comedy films together.