From Wikipedia:

Zachary Knight "ZachGalifianakis[1] (/ˌɡælɨfəˈnækɨs/ gal-i-fə-nak-iss; born October 1, 1969)[2] is an American stand-up comedian and actor of Greek ancestry known for his film and television appearances including his own Comedy Central Presents special. He has garnered attention for his role as Alan Garner in The Hangover trilogy, directed by Todd Phillips and in the road trip comedy Due Date.

Galifianakis voiced Lucas Bortner in the 17th episode of Season 25 "Luca$".

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