Mark Harmon
Acting • Born 1951-09-02
Biography
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.
Filmography
101 credits
Getting Married
Movie • 1978
Howie Lesser
Fear and Loathing in Las Vegas
Movie • 1998
Magazine Reporter
Freaky Friday
Movie • 2003
Ryan
Original Sins
Movie • 1995
Johnathan Franye
Justice League: Crisis on Two Earths
Movie • 2010
Superman (voice)
Beyond the Poseidon Adventure
Movie • 1979
Larry Simpson
The Presidio
Movie • 1988
Jay Austin
Magic in the Water
Movie • 1995
Jack Black
Wyatt Earp
Movie • 1994
Sheriff Johnny Behan
Worth Winning
Movie • 1989
Taylor Worth
Stealing Home
Movie • 1988
Billy Wyatt
The Last Supper
Movie • 1995
Dominant Male
Crossfire Trail
Movie • 2001
Bruce Barkow
Comes a Horseman
Movie • 1978
Billy Joe Meynert
Summer School
Movie • 1987
Mr. Freddy Shoop
Dear America: Letters Home from Vietnam
Movie • 1987
(voice)
Local Boys
Movie • 2002
Jim Wesley
Weather Girl
Movie • 2009
Dale
Sweet Bird of Youth
Movie • 1989
Chance Wayne
The Deliberate Stranger
Movie • 1986
Ted Bundy
After the Promise
Movie • 1987
Elmer Jackson
Certain Prey
Movie • 2011
Lucas Davenport
Tuareg: Desert Warrior
Movie • 1984
Gacel Sayah
And Never Let Her Go
Movie • 2001
Thomas Capano
Cold Heaven
Movie • 1992
Alex Davenport
Prince of Bel Air
Movie • 1986
Robin Prince
For All Time
Movie • 2000
Charles Lattimer
Intimate Agony
Movie • 1983
Tommy
Shadow of a Doubt
Movie • 1991
Charles Spencer
Dillinger
Movie • 1991
John Dillinger
Eleanor and Franklin: The White House Years
Movie • 1977
Robert Dunlap
Long Road Home
Movie • 1991
Ertie Robertson
Casualties
Movie • 1997
Tommy Nance
Till There Was You
Movie • 1991
Frank Flynn
Let's Get Harry
Movie • 1986
Harry
Flamingo Road
Movie • 1980
Fielding Carlyle
Fourth Story
Movie • 1991
David Shepard
Little Mo
Movie • 1978
Norman Brinker
NCISverse: The First 1,000
Movie • 2024
Self
Freakier Friday
Movie • 2025
Ryan
Natural Born Killers
Movie • 1994
Mickey Knox in TV
The First to Go
Movie • 1997
Jeremy Hampton
Sonic Boom
Movie • 1974
Student Controller
The Wild
Movie • 2019
Self
I'll Remember April
Movie • 1999
John Cooper
Chasing Liberty
Movie • 2004
James Foster
The Amati Girls
Movie • 2001
Lawrence
Intimate Portrait: Pam Dawber
Movie • 2002
Self
St. Elsewhere
TV • 1982
Robert Caldwell
The Tony Danza Show
TV • 2004
Self
Jimmy Kimmel Live!
TV • 2003
Self
The Rosie O'Donnell Show
TV • 1996
Self
The Love Boat
TV • 1977
Doug Bradbury
The Legend of Tarzan
TV • 2001
Bob Markham (voice)
Moonlighting
TV • 1985
Sam Crawford
Flamingo Road
TV • 1981
Field Carlyle
The View
TV • 1997
Self
240-Robert
TV • 1979
Thib Thibideaux
The Tonight Show with Jay Leno
TV • 1992
The Hardy Boys / Nancy Drew Mysteries
TV • 1977
From the Earth to the Moon
TV • 1998
Wally Schirra
Laverne & Shirley
TV • 1976
All's Fair
TV • 1976
NCIS
TV • 2003
Leroy Jethro Gibbs
JAG
TV • 1995
Leroy Jethro Gibbs
Centennial
TV • 1978
Captain John McIntosh
Hallmark Hall of Fame
TV • 1951
Charles
Chicago Hope
TV • 1994
Jack McNeil
Reasonable Doubts
TV • 1991
Det. Dicky Cobb
Sam
TV • 1978
Mike Breen
Harts of the West
TV • 1993
Charlie Grace
TV • 1995
Charlie Grace
The Dream Merchants
TV • 1980
Johnny Edge
Ozzie's Girls
TV • 1973
The Bonnie Hunt Show
TV • 2008
Self
Saturday Night Live
TV • 1975
Self - Host
The West Wing
TV • 1999
Simon Donovan
The Late Late Show with James Corden
TV • 2015
Self
Adam-12
TV • 1968
Officer Gus Corbin
Goliath Awaits
TV • 1981
Peter Cabot
The American West
TV • 2016
Self
Police Woman
TV • 1974
Stanski
The Kelly Clarkson Show
TV • 2019
Self
The Tonight Show Starring Johnny Carson
TV • 1962
Self
All or Nothing: The Michigan Wolverines
TV • 2018
Narrator (voice)
NCIS: New Orleans
TV • 2014
Leroy Jethro Gibbs
The Arsenio Hall Show
TV • 2013
Self
Entertainment Tonight
TV • 1981
Self
Delvecchio
TV • 1976
Ronnie Striker
Family Guy
TV • 1999
Leroy Jethro Gibbs (voice)
And Never Let Her Go
TV • 2001
Thomas Capano
Joe Montana: Cool Under Pressure
TV • 2022
Self - Narrator (voice)
The Megan Mullally Show
TV • 2006
Self - Guest
Golden Globe Awards
TV • 1944
Self - Nominee
NCIS: Origins
TV • 2024
Older Leroy Jethro Gibbs (voice) (uncredited)
Golden Globe Awards
TV • 1944
Self
Emergency!
TV • 1972
Ofcr. Dave Gordon
Police Woman
TV • 1974
Paul Donin
The Deliberate Stranger
TV • 1986
Ted Bundy
NCIS: Origins
TV • 2024
Older Leroy Jethro Gibbs (uncredited)
The Late Show with Stephen Colbert
TV • 2015
Self - Guest