How many movies have Alan Horn and Fran Walsh collaborated on?

They have worked on 3 movies together! Their first movie together was The Hobbit: An Unexpected Journey (2012) while their highest rated movie together was The Hobbit: The Desolation of Smaug (2013). They have not worked together since The Hobbit: The Battle of the Five Armies (2014). They are most known for their adventure films together.