Mark Harmon
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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
Credits
Freakier Friday (2025)
as Ryan
Fear and Loathing in Las Vegas (1998)
as Magazine Reporter
Freaky Friday (2003)
as Ryan
Natural Born Killers (1994)
as Mickey Knox in TV
Little Mo (1978)
as Norman Brinker
Wyatt Earp (1994)
as Sheriff Johnny Behan
Chasing Liberty (2004)
as James Foster
Crossfire Trail (2001)
as Bruce Barkow
Summer School (1987)
as Mr. Freddy Shoop
The Last Supper (1995)
as Dominant Male
Justice League: Crisis on Two Earths (2010)
as Superman (voice)
Cold Heaven (1992)
as Alex Davenport
The Deliberate Stranger (1986)
as Ted Bundy
The Presidio (1988)
as Jay Austin
Beyond the Poseidon Adventure (1979)
as Larry Simpson
Comes a Horseman (1978)
as Billy Joe Meynert
Weather Girl (2009)
as Dale
After the Promise (1987)
as Elmer Jackson
Casualties (1997)
as Tommy Nance
Certain Prey (2011)
as Lucas Davenport
Local Boys (2002)
as Jim Wesley
Magic in the Water (1995)
as Jack Black
And Never Let Her Go (2001)
as Thomas Capano
Stealing Home (1988)
as Billy Wyatt
Let's Get Harry (1986)
as Harry
Dear America: Letters Home from Vietnam (1987)
as (voice)
NCISverse: The First 1,000 (2024)
as Self
Prince of Bel Air (1986)
as Robin Prince
Intimate Agony (1983)
as Tommy
The Amati Girls (2001)
as Lawrence
Sweet Bird of Youth (1989)
as Chance Wayne
I'll Remember April (1999)
as John Cooper
For All Time (2000)
as Charles Lattimer
Intimate Portrait: Pam Dawber (2002)
as Self
Worth Winning (1989)
as Taylor Worth
The First to Go (1997)
as Jeremy Hampton
Original Sins (1995)
as Johnathan Franye
Shadow of a Doubt (1991)
as Charles Spencer
Fourth Story (1991)
as David Shepard
Long Road Home (1991)
as Ertie Robertson
Tuareg: Desert Warrior (1984)
as Gacel Sayah
Getting Married (1978)
as Howie Lesser
Dillinger (1991)
as John Dillinger
Till There Was You (1991)
as Frank Flynn
Eleanor and Franklin: The White House Years (1977)
as Robert Dunlap
Sonic Boom (1974)
as Student Controller
Flamingo Road (1980)
as Fielding Carlyle
The Wild (2019)
as Self