Tim Blake Nelson (born May 11, 1964) is an American actor, director, and writer who played Roger Johnson in the 1995 Disney comedy film Heavyweights and Dr. Pendanski in the 2003 Disney comedy-drama film Holes. He also portrayed the Leader in The Incredible Hulk and Delmar O'Donnell in the 2000 Touchstone Pictures film O Brother, Where Art Thou?.