T.R. Knight is an American actor known for his role as Dr. George O'Malley on ABC's medical drama, Grey's Anatomy. Other television credits include Ryan Lemming on CBS’ Charlie Lawrence and Jordan Karahalios on ABC’s The Good Wife with guest appearances on Law & Order: Special Victims Unit, Sesame Street, CSI, Law & Order: Criminal Intent and Frasier.

Broadway credits include his debut as Tim Allgood in a revival of Noises Off (Brooks Atkinson Theatre); Damis in a revival of Tartuffe (American Airlines Theatre); John in A Life In The Theatre (Gerald Schoenfeld Theatre); and Frank Finger in It’s Only a Play (Bernard B. Jacobs Theatre). Off-Broadway credits include Pocatello (Playwrights Horizons); Romeo and Juliet (Classic Stage Theatre); The Miser (Lucille Lortel Theatre); This Lime Tree Bower and Boy (45th Street Theatre); and Scattergood (Samuel Beckett Theatre). Regionally, T.R. starred as Leo Frank in the musical Parade (Mark Taper Forum).