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