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Thomas Mark Harmon (born September 2, 1951) is an American television and movie actor who has appeared in a wide variety of roles since the mid-1970s. Since 2003, Harmon has starred as former Gunnery Sergeant/Marine sniper turned NCIS Special Agent Leroy Jethro Gibbs in the once-hit CBS series, NCIS.

Mark is one of the four Executive Producers of NCIS: New Orleans.

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