Thomas Mark Harmon (born September 2, 1951) is an American actor, producer and director. He is known for playing the lead role of Leroy Jethro Gibbs on NCIS (2003-2021), a role which has earned him six nominations at the People’s Choice Awards including a win for Favorite TV Crime Drama Actor in 2017. Since 2008, he has also been a producer and executive producer of the show as well as its’ spinoff series NCIS: New Orleans. His character of NCIS special agent Leroy Jethro Gibbs was introduced in a guest starring role in two episodes of JAG, and continued on the spinoff show NCIS.
He had a recurring role as Secret Service special agent Simon Donovan in a four-episode story arc in The West Wing in 2002, for which he received an Emmy Award nomination.
One of his first national TV appearances (other than as an athlete) was in a commercial for Kellogg’s Product 19 cereal with his father, Tom Harmon, its longstanding TV spokesman. Thanks to his sister Kristin’s in-laws, Ozzie and Harriet Nelson, he landed his first job as an actor in an episode of Ozzie’s Girls.
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.
1999 • TV
2003 • TV
1962 • TV
2019 • TV
2025 • Movie
2003 • Movie
as Ryan
as Ryan
as Howie Lesser
as Mickey Knox in TV
as Magazine Reporter
as Alex Davenport
as Bruce Barkow
as Sheriff Johnny Behan
as Ted Bundy
as Self
as Charles Lattimer
as Tommy Nance
as Gacel Sayah
as Ertie Robertson
as Jay Austin
as Robin Prince
as Superman (voice)
as John Dillinger
as James Foster
as Mr. Freddy Shoop
Executive Producer
as Leroy Jethro Gibbs (voice)
1 episodes
as Leroy Jethro Gibbs
435 episodes
as Self
1 episodes
as Self
1 episodes
as Simon Donovan
4 episodes
as Self - Nominee
3 episodes
as Self
1 episodes
as Leroy Jethro Gibbs
2 episodes
as Self - Host
1 episodes
as Self
1 episodes
as Self
1 episodes
as Self
1 episodes
as Doug Bradbury
3 episodes
1 episodes
as Jack McNeil
96 episodes
as Robert Caldwell
59 episodes
as Leroy Jethro Gibbs
4 episodes
as Officer Gus Corbin
1 episodes
as Ofcr. Dave Gordon
1 episodes
as Sam Crawford
4 episodes
Director
Director
Executive Producer
Executive Producer
Producer
Executive Producer
