How many movies have J. R. R. Tolkien and John McKay collaborated on?

They have worked on 4 movies together! Their first movie together was The Lord of the Rings: The Fellowship of the Ring (2001) while their highest rated movie together was The Lord of the Rings: The Return of the King (2003). They have not worked together since The Hobbit: The Battle of the Five Armies (2014). They are most known for their adventure films together.