How many movies have CJ Vanston and Christopher Guest collaborated on?

They have worked on 7 movies together! Their first movie together was The Return of Spinal Tap (1992) while their highest rated movie together was Unwigged & Unplugged: An Evening with Christopher Guest, Michael McKean and Harry Shearer (2009). They have not worked together since Mascots (2016). They are most known for their comedy films together.