Liam O'Brien is an American voice actor and voice director perhaps best known for his roles as Gaara of the Sand in Naruto, Captain Jushiro Ukitake in Bleach, War in the video game Darksiders, Vincent Law in Ergo Proxy, Yasuo the Unforgiven in League of Legends and Illidan Stormrage in the Warcraft game series. He is married to fellow voice actress Amy Kincaid.
O'Brien is also one of the English adaptation writers for the popular series, Naruto. O'Brien is usually cast in unusual roles; as such, he tends to play characters who show signs of insanity or are evil geniuses. Some of those include: Gaara from Naruto, Lloyd from Code Geass, Isaac from Castlevania: Curse Of Darkness, Lezard from Valkyrie Profile 2, Grimoire Weiss from Nier, Kain from Final Fantasy IV, Caius Ballad from Final Fantasy XIII-2, Dist from Tales of the Abyss, Asura from Asura's Wrath and Akihiko Sanada from Shin Megami Tensei: Persona 3. He was nominated for Best Actor in a Comedy by the American Anime Awards for his work in Comic Party, DNA Squared, and Girls Bravo. He is also the voice of Wonderful Pistachios.
He currently hosts the All Work No Play podcast with fellow voice actor Sam Riegel.