Barnz graduated from Yale University and the University of Southern California Film School. He made his directorial debut in the 2001 movie, The Cutting Room. He directed the 2009 movie, Phoebe in Wonderland, which received mixed reviews from critics. He wrote and directed a movie adaption of the novel Beastly, a modern-day take on Beauty and the Beast. The movie was released on March 4, 2011.