Liam O'Brien is an American voice actor, writer, and director. He executive produced and starred in The Legend of Vox Machina and voiced Gaara in Naruto Shippúden. O'Brien also voiced Professor Maelstrom, Boris, and Vlad in the series Carmen Sandiego, and Yogar Lyste, Morad Sumar, and Imperial Supply Master in the series Star Wars: Rebels. He appeared in the films Hulk: Where Monsters Dwell alongside Laura Bailey and Fred Tatasciore, and The Quiet Hour. O'Brien has also worked on many video game and animation projects.