Zacharius Knight "Zach" Galifianakis ( /ˌɡælɪfəˈnækɪs/ GAL-i-fə-NAK-iss; born October 1, 1969) is an American stand-up comedian and actor, known for his numerous film and television appearances including his own Comedy Central Presents special. While initially more of an "underground" comedian, he has garnered mainstream attention for his roles in the Todd Phillips-directed comedy films The Hangover and Due Date..