Eric "Butters" Stough (born July 31, 1972) is an American animator and producer. He is best known as the animation director and a producer on the television series South Park. Born in Evergreen, Colorado, Stough attended the University of Colorado at Boulder and graduated in 1995 with a degree in film. A longtime friend of Trey Parker, he has worked with him and Matt Stone on most of their projects, including South Park, South Park: Bigger, Longer & Uncut, Orgazmo, Team America: World Police and the Broadway musical The Book of Mormon.