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Mark Harmon is an actor from the 1970s to the present. He is best known for his role as Leroy Jethro Gibbs on TV's "NCIS: Naval Criminal Investigative Services" and as Dr. Robert Caldwell on "St. Elsewhere". Some of his movies include: Comes a Horseman, Natural Born Killers, Fear and Loathing in Las Vegas. Of course, he is the son of Tom Harmon and Elyse Knox, and his sister is Kristin Harmon! He is also married to actress Pam Dawber.
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