Liam O'Brien is an American actor and screenwriter. He was born on May 28, 1976, in Belleville, New Jersey. O'Brien holds US citizenship and attended St. Peter's Preparatory School. He later studied at the Tisch School of the Arts.
O'Brien is best known as the founder of Critical Role, a popular web series involving voice actors playing Dungeons & Dragons. His notable works include acting roles in series and movies such as Code Geass, Fate/Zero, Tiger & Bunny, The Last: Naruto the Movie, Boruto: Naruto the Movie, Boruto: Naruto Next Generations, and Naruto Shippuden.