Theodore is an open gay. In the late 2010, he was seen with his boyfriend Patrick Leahy. After having love affairs for about three years, they entered into the married bonding on 5th of October 2013. There is no any information about his girlfriend, wife and his divorce.
When Theodore was just five, he showed an interest in acting and his parents enrolled him in Guthrie Theater. He received his formal education from Annunciation Catholic School. Later he joined Academy of Holy Angels and completed his high school graduation from there. He also won Conners Foundation Scholarship. After his high school graduation, he joined University of Minnesota but he dropped out from there to pursue his acting career. In 1998, he starred in an internet off Broadway Marvin's Room. Next year he starred in This Lime Tree Bower as Joe and Macbeth as Donalbain/Messenger. He made his Broadway debut in 2001 by starring in the play Noises Off. He was found playing the role of Tim Allgood in this play. He played his debut movie role in 2002 by starring the role of Danial in the movie Garmento. For his role in the TV series Grey's Anatomy, he earned the salary of $125,000 per episode. His net worth is $3 million.