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Full Name at Birth
Thomas Mark Harmon
Date of Birth
Claim to Fame
The Presidio (1988), NCIS (2003-Present).
Mark Harmon Biography »
Thomas Mark Harmon (born September 2, 1951) is an American actor. Since the mid-1970s, he has appeared in a variety of television, film and stage roles following a career as a two-year starter as a collegiate football player with the UCLA Bruins. Since 2003, Harmon has starred as Leroy Jethro Gibbs in the hit CBS series NCIS.
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