High Quality Content by WIKIPEDIA articles! Zacharius Knight "Zach" Galifianakis (born October 1, 1969) is an American comedian and actor, known for numerous film and television appearances including his own Comedy Central Presents special. He is known for his unconventional stand-up style, that features the reading of one-liners while playing a piano during his performances. While initially more of an "underground" and lesser-known comedian, he garnered considerable mainstream attention with his successful 2009 comedy The Hangover.