Mark Harmon
Acting
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.
TV Shows(50)
NCIS: Origins
Older Leroy Jethro Gibbs (voice) (uncredited)
2024
Joe Montana: Cool Under Pressure
Self - Narrator (voice)
2022
The Kelly Clarkson Show
Self
2019
All or Nothing: The Michigan Wolverines
Narrator (voice)
2018
The American West
Self
2016
The Late Show with Stephen Colbert
Self - Guest
2015
The Late Late Show with James Corden
Self
2015
NCIS: New Orleans
Leroy Jethro Gibbs
2014
The Arsenio Hall Show
Self
2013
The Bonnie Hunt Show
Self
2008
The Megan Mullally Show
Self - Guest
2006
The Tony Danza Show
Self
2004
NCIS
Leroy Jethro Gibbs
2003
Jimmy Kimmel Live!
Self
2003
The Legend of Tarzan
Bob Markham (voice)
2001
And Never Let Her Go
Thomas Capano
2001
The West Wing
Simon Donovan
1999
Family Guy
Leroy Jethro Gibbs (voice)
1999
From the Earth to the Moon
Wally Schirra
1998
The View
Self
1997
The Rosie O'Donnell Show
Self
1996
JAG
Leroy Jethro Gibbs
1995
Charlie Grace
Charlie Grace
1995
Chicago Hope
Jack McNeil
1994
Harts of the West
1993
The Tonight Show with Jay Leno
1992
Reasonable Doubts
Det. Dicky Cobb
1991
The Deliberate Stranger
Ted Bundy
1986
Moonlighting
Sam Crawford
1985
St. Elsewhere
Robert Caldwell
1982
Goliath Awaits
Peter Cabot
1981
Entertainment Tonight
Self
1981
Flamingo Road
Field Carlyle
1981
The Dream Merchants
Johnny Edge
1980
240-Robert
Thib Thibideaux
1979
Centennial
Captain John McIntosh
1978
Sam
Mike Breen
1978
The Love Boat
Doug Bradbury
1977
The Hardy Boys / Nancy Drew Mysteries
1977
All's Fair
1976
Delvecchio
Ronnie Striker
1976
Laverne & Shirley
1976
Saturday Night Live
Self - Host
1975
Police Woman
Stanski
1974
Ozzie's Girls
1973
Emergency!
Ofcr. Dave Gordon
1972
Adam-12
Officer Gus Corbin
1968
The Tonight Show Starring Johnny Carson
Self
1962
Hallmark Hall of Fame
Charles
1951
Golden Globe Awards
Self - Nominee
1944
Movies(48)
Freakier Friday
Ryan
2025
NCISverse: The First 1,000
Self
2024
The Wild
Self
2019
Certain Prey
Lucas Davenport
2011
Justice League: Crisis on Two Earths
Superman (voice)
2010
Weather Girl
Dale
2009
Chasing Liberty
James Foster
2004
Freaky Friday
Ryan
2003
Local Boys
Jim Wesley
2002
Intimate Portrait: Pam Dawber
Self
2002
And Never Let Her Go
Thomas Capano
2001
Crossfire Trail
Bruce Barkow
2001
The Amati Girls
Lawrence
2001
For All Time
Charles Lattimer
2000
I'll Remember April
John Cooper
1999
Fear and Loathing in Las Vegas
Magazine Reporter
1998
Casualties
Tommy Nance
1997
The First to Go
Jeremy Hampton
1997
The Last Supper
Dominant Male
1995
Magic in the Water
Jack Black
1995
Original Sins
Johnathan Franye
1995
Natural Born Killers
Mickey Knox in TV
1994
Wyatt Earp
Sheriff Johnny Behan
1994
Cold Heaven
Alex Davenport
1992
Till There Was You
Frank Flynn
1991
Shadow of a Doubt
Charles Spencer
1991
Long Road Home
Ertie Robertson
1991
Fourth Story
David Shepard
1991
Dillinger
John Dillinger
1991
Worth Winning
Taylor Worth
1989
Sweet Bird of Youth
Chance Wayne
1989
Stealing Home
Billy Wyatt
1988
The Presidio
Jay Austin
1988
After the Promise
Elmer Jackson
1987
Dear America: Letters Home from Vietnam
(voice)
1987
Summer School
Mr. Freddy Shoop
1987
Let's Get Harry
Harry
1986
The Deliberate Stranger
Ted Bundy
1986
Prince of Bel Air
Robin Prince
1986
Tuareg: Desert Warrior
Gacel Sayah
1984
Intimate Agony
Tommy
1983
Flamingo Road
Fielding Carlyle
1980
Beyond the Poseidon Adventure
Larry Simpson
1979
Comes a Horseman
Billy Joe Meynert
1978
Little Mo
Norman Brinker
1978
Getting Married
Howie Lesser
1978
Eleanor and Franklin: The White House Years
Robert Dunlap
1977
Sonic Boom
Student Controller
1974