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Keir O'Donnell is an Australian actor who played the role of Thomas.
Born on November 8, 1978, O'Donnell was the son of a British mother and Australian father, giving him dual citizenship (and also giving him tri-citizenship when he moved to America with his family eight years later). After graduating from the Hartt School in Connecticut (in which he starred in many plays), he moved to Los Angeles. During his time there, he gained roles in the several television shows, including CSI:Crime Scene Investigation, 8 Simple Rules and Killer Instinct (as well as Lost). He also starred in the films Wedding Crashers, The Break Up and Starkweather. Most recently, he starred in Paul Blart:Mall Cop opposite Kevin James.
- The character he played in the film Wedding Crashers was also a painter.