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Liam O'Brien, born May 28, 1976 in Bellevelle, New Jersey, is an American voice actor. He provides voices for the infected in The Last of Us. In addition to that he is also the VO director of the game. 
Liam O'Brien's best known voice is Gaara from Naruto and Naruto Shippuden. O'Brien is also the voice of WAR from the Darksiders series, Asura from the English version of Asura's Wrath, and Daniel Mason from Red Faction: Guerilla. He has also worked with Troy Baker, Joel's voice actor, in Final Fantasy XIII-2 wherein he played Caius Ballad.