Mark Harmon
Known for: Acting
Mark Harmon (born September 2, 1951, in Burbank, California) is an American actor, producer and director. The son of football star Tom Harmon and actress Elyse Knox, he played college football at UCLA before turning to acting in the mid-1970s. He became known for St. Elsewhere and Chicago Hope and starred as Leroy Jethro Gibbs on NCIS from 2003 to 2021, a character introduced on JAG, also serving as a producer of the series. He received an Emmy nomination for his recurring role as Secret Service agent Simon Donovan on The West Wing, and his film work includes Summer School, The Presidio, Wyatt Earp and Freaky Friday.
Filmography
Series
The Kelly Clarkson Show
Self
2019
Series
Family Guy
Leroy Jethro Gibbs (voice)
1999
Series
The Tonight Show Starring Johnny Carson
Self
1962
Series
NCIS
Leroy Jethro Gibbs
2003
Series
The Late Show with Stephen Colbert
Self - Guest
2015
Series
Saturday Night Live
Self - Host
1975
Series
The View
Self
1997
Series
The Late Late Show with James Corden
Self
2015
Series
Jimmy Kimmel Live!
Self
2003
Series
The West Wing
Simon Donovan
1999
Series
JAG
Leroy Jethro Gibbs
1995
Series
The Tonight Show with Jay Leno
1992
Series
The Love Boat
Doug Bradbury
1977
Series
Chicago Hope
Jack McNeil
1994
Series
Golden Globe Awards
Self - Nominee
1944
Series
Golden Globe Awards
Self
1944
Series
Adam-12
Officer Gus Corbin
1968
Series
NCIS: New Orleans
Leroy Jethro Gibbs
2014
Series
St. Elsewhere
Robert Caldwell
1982
Series
Emergency!
Ofcr. Dave Gordon
1972
Series
Laverne & Shirley
1976
Series
Laverne & Shirley
Victor
1976
The Tony Danza Show
Self
2004
Series
Moonlighting
Sam Crawford
1985
Series
The Bonnie Hunt Show
Self
2008
Series
Police Woman
Stanski
1974
Series
Police Woman
Paul Donin
1974
Series
NCIS: Origins
Older Leroy Jethro Gibbs (voice) (uncredited)
2024
Series
NCIS: Origins
Older Leroy Jethro Gibbs
2024
Series
The Megan Mullally Show
Self - Guest
2006
Series
The Legend of Tarzan
Bob Markham (voice)
2001
Series
Entertainment Tonight
Self
1981
Series
Steve Harvey
Self
2012
Series
The Hardy Boys / Nancy Drew Mysteries
1977
Series
The Arsenio Hall Show
Self
2013
Series
From the Earth to the Moon
Wally Schirra
1998
Series
The Rosie O'Donnell Show
Self
1996
Film
Freaky Friday
Ryan
2003
Film
Natural Born Killers
Mickey Knox in TV
1994
Series
Reasonable Doubts
Det. Dicky Cobb
1991
Series
Centennial
Captain John McIntosh
1978
Film
Fear and Loathing in Las Vegas
Magazine Reporter
1998
Series
Flamingo Road
Field Carlyle
1981
Film
Freakier Friday
Ryan
2025
Series
Delvecchio
Ronnie Striker
1976
Series
240-Robert
Thib Thibideaux
1979
Series
Charlie Grace
Charlie Grace
1995
Series
Hallmark Hall of Fame
Charles
1951
Series
Harts of the West
1993
Series
All's Fair
1976
Series
All or Nothing: The Michigan Wolverines
Narrator (voice)
2018
Film
Wyatt Earp
Sheriff Johnny Behan
1994
Series
Stand Up to Cancer
Self
2008
Series
The American West
Self
2016
Series
Strangers
Mark
1996
Series
The Dream Merchants
Johnny Edge
1980
Series
Goliath Awaits
Peter Cabot
1981
Film
Justice League: Crisis on Two Earths
Superman (voice)
2010
Series
Joe Montana: Cool Under Pressure
Self - Narrator (voice)
2022
Series
The Deliberate Stranger
Ted Bundy
1986
Film
Chasing Liberty
James Foster
2004
Film
The Presidio
Jay Austin
1988
Film
Beyond the Poseidon Adventure
Larry Simpson
1979
Film
Cold Heaven
Alex Davenport
1992
Ozzie's Girls
1973
Film
Weather Girl
Dale
2009
Film
Let's Get Harry
Harry
1986
Film
Local Boys
Jim Wesley
2002
Series
And Never Let Her Go
Thomas Capano
2001
Film
The Deliberate Stranger
Ted Bundy
1986
Film
Summer School
Freddy Shoop
1987
Film
The Last Supper
Dominant Male
1995
Series
Sam
Mike Breen
1978
Film
Dear America: Letters Home from Vietnam
(voice)
1987
Film
Crossfire Trail
Bruce Barkow
2001
Film
Comes a Horseman
Billy Joe Meynert
1978
Film
Prince of Bel Air
Robin Prince
1986
Film
Casualties
Tommy Nance
1997
Film
Sweet Bird of Youth
Chance Wayne
1989
Film
Magic in the Water
Jack Black
1995
Film
After the Promise
Elmer Jackson
1987
Film
Certain Prey
Lucas Davenport
2011
Film
And Never Let Her Go
Thomas Capano
2001
Film
Tuareg: Desert Warrior
Gacel Sayah
1984
Film
Stealing Home
Billy Wyatt
1988
Film
Little Mo
Norman Brinker
1978
Film
For All Time
Charles Lattimer
2000
Film
The Amati Girls
Lawrence
2001
Film
Dillinger
John Dillinger
1991
Film
NCISverse: The First 1,000
Self
2024
Film
Worth Winning
Taylor Worth
1989
Eleanor and Franklin: The White House Years
Robert Dunlap
1977
Film
Intimate Agony
Tommy
1983
Film
Fourth Story
David Shepard
1991
Film
Original Sins
Johnathan Franye
1995
Film
The First to Go
Jeremy Hampton
1997
Film
Getting Married
Howie Lesser
1978
Film
I'll Remember April
John Cooper
1999
Film
Till There Was You
Frank Flynn
1991
Shadow of a Doubt
Charles Spencer
1991
Intimate Portrait: Pam Dawber
Self
2002
Film
Long Road Home
Ertie Robertson
1991
Film
Sonic Boom
Student Controller
1974
Film
Flamingo Road
Fielding Carlyle
1980
Film
The Wild
Self
2019