Mark Harmon
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"Thomas Mark Harmon" 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 hit CBS series, NCIS (TV series)/NCIS, a role that has become Harmon's best-known role to date while also giving him international recognition.

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