Mark Harmon
Born: 1951-09-02 in Burbank, California, USA
Known For: Acting
Biography
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
2025
- Freakier Friday as Ryan
2024
- NCIS: Origins as Older Leroy Jethro Gibbs (voice) (uncredited)
- NCISverse: The First 1,000 as Self
2022
- Joe Montana: Cool Under Pressure as Self - Narrator (voice)
2019
- The Kelly Clarkson Show as Self
- The Wild as Self
2018
- All or Nothing: The Michigan Wolverines as Narrator (voice)
2016
- The American West as Self
2015
- The Late Show with Stephen Colbert as Self - Guest
- The Late Late Show with James Corden as Self
2014
- NCIS: New Orleans as Leroy Jethro Gibbs
2013
- The Arsenio Hall Show as Self
2012
- Steve Harvey as Self
2011
- Certain Prey as Lucas Davenport
2010
- Justice League: Crisis on Two Earths as Superman (voice)
2009
- Weather Girl as Dale
2008
- The Bonnie Hunt Show as Self
- Stand Up to Cancer as Self
2006
- The Megan Mullally Show as Self - Guest
2004
- The Tony Danza Show as Self
- Chasing Liberty as James Foster
2003
- NCIS as Leroy Jethro Gibbs
- Jimmy Kimmel Live! as Self
- Freaky Friday as Ryan
2002
- Local Boys as Jim Wesley
- Intimate Portrait: Pam Dawber as Self
2001
- The Legend of Tarzan as Bob Markham (voice)
- Crossfire Trail as Bruce Barkow
- And Never Let Her Go as Thomas Capano
- And Never Let Her Go as Thomas Capano
- The Amati Girls as Lawrence
2000
- Boston Public ... (Director)
- For All Time as Charles Lattimer
1999
- Family Guy as Leroy Jethro Gibbs (voice)
- The West Wing as Simon Donovan
- I'll Remember April as John Cooper
1998
- From the Earth to the Moon as Wally Schirra
- Fear and Loathing in Las Vegas as Magazine Reporter
1997
- The View as Self
- Casualties as Tommy Nance
- The First to Go as Jeremy Hampton
1996
- The Rosie O'Donnell Show as Self
- Strangers as Mark
1995
- JAG as Leroy Jethro Gibbs
- Charlie Grace as Charlie Grace
- The Last Supper as Dominant Male
- Magic in the Water as Jack Black
- Original Sins as Johnathan Franye
1994
- Chicago Hope as Jack McNeil
- Natural Born Killers as Mickey Knox in TV
- Wyatt Earp as Sheriff Johnny Behan
1993
1992
- The Tonight Show with Jay Leno
- Cold Heaven as Alex Davenport
1991
- Reasonable Doubts as Det. Dicky Cobb
- Dillinger as John Dillinger
- Till There Was You as Frank Flynn
- Fourth Story as David Shepard
- Long Road Home as Ertie Robertson
- Shadow of a Doubt as Charles Spencer
1989
- Sweet Bird of Youth as Chance Wayne
- Worth Winning as Taylor Worth
1988
- The Presidio as Jay Austin
- Stealing Home as Billy Wyatt
1987
- Summer School as Freddy Shoop
- Dear America: Letters Home from Vietnam as (voice)
- After the Promise as Elmer Jackson
1986
- The Deliberate Stranger as Ted Bundy
- Let's Get Harry as Harry
- The Deliberate Stranger as Ted Bundy
- Prince of Bel Air as Robin Prince
1985
- Moonlighting as Sam Crawford
1984
- Tuareg: Desert Warrior as Gacel Sayah
1983
- Intimate Agony as Tommy
1982
- St. Elsewhere as Robert Caldwell
1981
- Entertainment Tonight as Self
- Flamingo Road as Field Carlyle
- Goliath Awaits as Peter Cabot
1980
- The Dream Merchants as Johnny Edge
- Flamingo Road as Fielding Carlyle
1979
- 240-Robert as Thib Thibideaux
- Beyond the Poseidon Adventure as Larry Simpson
1978
- Centennial as Captain John McIntosh
- Comes a Horseman as Billy Joe Meynert
- Sam as Mike Breen
- Little Mo as Norman Brinker
- Getting Married as Howie Lesser
1977
- The Love Boat as Doug Bradbury
- The Hardy Boys / Nancy Drew Mysteries
- Eleanor and Franklin: The White House Years as Robert Dunlap
1976
- Laverne & Shirley
- Delvecchio as Ronnie Striker
- All's Fair
1975
- Saturday Night Live as Self - Host
1974
- Police Woman as Stanski
- Sonic Boom as Student Controller
1973
1972
- Emergency! as Ofcr. Dave Gordon
1968
- Adam-12 as Officer Gus Corbin
1962
1951
- Hallmark Hall of Fame as Charles
1944
- Golden Globe Awards as Self - Nominee