Theodore Raymond “T.R.” Knight is an Emmy Award-nominated and Screen Actors Guild Award-winning American actor. Knight's most high-profile role to date is his current role as Dr. George O'Malley on ABC's top-rated, hit medical drama "Grey's Anatomy".

Knight was born in Minneapolis, Minnesota, where he became involved with the Guthrie Theater at the age of five. After finishing high school at the Academy of Holy Angels in Richfield, Knight enrolled at the University of Minnesota for a brief period of time. He dropped out and soon landed leading roles at the Guthrie Theater.

Knight moved to New York City and has appeared on Broadway; his most notable role was playing opposite Patti LuPone in the 2001 revival of "Noises Off". Knight's most recent stage appearance was in the 2004 drama, Boy. He also gained notice performing in 2003 as Damis in Tartuffe and received a Drama Desk Award nomination in 2003 for his role in the off-Broadway production of "Scattergood".

On television, Knight was a regular cast member of the short-lived Nathan Lane series, Charlie Lawrence, with Laurie Metcalf. In 2005, he was cast as the sweet, bumbling intern George O'Malley on the ABC medical drama "Grey's Anatomy". His role earned him a Primetime Emmy nomination for Outstanding Supporting Actor In A Drama Series in 2007.

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