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Thomas Mark Harmon is an American actor who is best known for his role as Leroy Jethro Gibbs on the CBS police procedural drama series, NCIS since 2003. He is also the executive producer in NCIS spin-off series NCIS: New Orleans since 2014. He is the husband of actress Pam Dawber.

His Disney roles are Ryan in the 2003 remake of Freaky Friday and Bob Markham in The Legend of Tarzan.

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