How many movies have Kelly Metzger and Walter P. Martishius collaborated on?

They have worked on 4 movies together! Their first movie together was Barbie Presents: Thumbelina (2009) while their highest rated movie together was Barbie: Princess Charm School (2011). They have not worked together since Barbie in A Mermaid Tale 2 (2012). They are most known for their family films together.