Mark Harmon photo

Mark Harmon

Acting
1951-09-02
Burbank, California, USA
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.
Known For 97 titles
Police Woman (1974) subtitle poster
Police Woman
1974 TV
as Paul Donin
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Laverne & Shirley (1976) subtitle poster
Laverne & Shirley
1976 TV
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The Megan Mullally Show (2006) subtitle poster
The Megan Mullally Show
2006 TV
as Self - Guest
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The Legend of Tarzan (2001) subtitle poster
The Legend of Tarzan
2001 TV
as Bob Markham (voice)
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The Hardy Boys / Nancy Drew Mysteries (1977) subtitle poster
The Hardy Boys / Nancy Drew Mysteries
1977 TV
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From the Earth to the Moon (1998) subtitle poster
From the Earth to the Moon
1998 TV
as Wally Schirra
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Freakier Friday (2025) subtitle poster
Freakier Friday
2025 Movie
as Ryan
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Charlie Grace (1995) subtitle poster
Charlie Grace
1995 TV
as Charlie Grace
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Reasonable Doubts (1991) subtitle poster
Reasonable Doubts
1991 TV
as Det. Dicky Cobb
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The Bonnie Hunt Show (2008) subtitle poster
The Bonnie Hunt Show
2008 TV
as Self
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Entertainment Tonight (1981) subtitle poster
Entertainment Tonight
1981 TV
as Self
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Centennial (1978) subtitle poster
Centennial
1978 TV
as Captain John McIntosh
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Natural Born Killers (1994) subtitle poster
Natural Born Killers
1994 Movie
as Mickey Knox in TV
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Fear and Loathing in Las Vegas (1998) subtitle poster
Fear and Loathing in Las Vegas
1998 Movie
as Magazine Reporter
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Flamingo Road (1981) subtitle poster
Flamingo Road
1981 TV
as Field Carlyle
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The Arsenio Hall Show (2013) subtitle poster
The Arsenio Hall Show
2013 TV
as Self
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Freaky Friday (2003) subtitle poster
Freaky Friday
2003 Movie
as Ryan
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Delvecchio (1976) subtitle poster
Delvecchio
1976 TV
as Ronnie Striker
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The Rosie O'Donnell Show (1996) subtitle poster
The Rosie O'Donnell Show
1996 TV
as Self
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Wyatt Earp (1994) subtitle poster
Wyatt Earp
1994 Movie
as Sheriff Johnny Behan
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Goliath Awaits (1981) subtitle poster
Goliath Awaits
1981 TV
as Peter Cabot
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240-Robert (1979) subtitle poster
240-Robert
1979 TV
as Thib Thibideaux
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The American West (2016) subtitle poster
The American West
2016 TV
as Self
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Harts of the West (1993) subtitle poster
Harts of the West
1993 TV
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