Terry O'Quinn (Aka) Terrance Quinn is an American actor, most famous for playing John Locke in the TV series, Lost. O'Quinn became known for his roles in Lost, Primal Fear and The X Files, The Stepfather and Stepfather II. His other notable works in films are Silver Bullet, Tombstone, Heaven's Gate, Young Guns, The Rocketeer and TV series like Star Trek: The Next Generation, The Twilight Zone and Homicide: Life on the Street.