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A. In the late eighties he was part of the cast of the Canadian premier of Key Exchange. In 1978 he appeared in three episodes of the acclaimed mini-series Centennial as Captain John MacIntoshan honorable Union cavalry officer.
Since 2003 Harmon has starred as Leroy Jethro Gibbs in the hit CBS series NCIS. Thomas Mark Harmon (born September 2 1951) is an American actor.