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Mark Harmon
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American actor (born 1951)

Thomas Mark Harmon (born September 2, 1951) is an American actor and former football player. He is perhaps best known for playing the lead role of Leroy Jethro Gibbs on NCIS. He has appeared in a wide variety of television roles since the early 1970s, including Dr. Robert Caldwell on St. Elsewhere, Detective Dicky Cobb on Reasonable Doubts, and...