Donald P. Bellisario, the creator of JAG and NCIS, saw him on The West Wing and had Harmon appear in a guest starring role in two episodes of JAG in April 2003, where Harmon was introduced as the character of NCIS agent Leroy Jethro Gibbs.

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Harmon played college football and found success as one of TV's hunkiest actors. While many of his roles have relied on good looks, Harmon was impressive on St. Elsewhere (1982) as the suave doctor who contracted AIDS.

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Mark Harmon is shedding a little light on going from being the lead on NCIS to working more behind the scenes on NCIS: Origins — and the Gibbs of it all. In Us Weekly ’s exclusive sneak peek ...

Mark Harmon and former NCIS special agent and technical advisor Leon Carroll Jr. joined the NCIS: Partners & Probies podcast for the May 5 episode. Harmon addresses where he thinks Gibbs is now ...

He has been starring in television and film since the mid-1970s, after a career as a collegiate football player with the UCLA Bruins. He's been married to actress Pam Dawber since 1987 and they have 2 sons. His son, actor Sean Harmon, had a recurring role as a young Leeroy Jethro Gibbs on NCIS.