★ 7.4 
Acting
Mark Harmon
Mark Harmon is best known for Family Guy, NCIS, The West Wing and Saturday Night Live. Mark Harmon was born on September 2, 1951. Mark Harmon is 75 years old (born September 2, 1951).
- Born
- September 2, 1951 (75 years old)
- Place of birth
- Burbank, California, USA
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.
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.
Known for
Filmography
- 2024NCIS: OriginsOlder Leroy Jethro Gibbs (voice) (uncredited)
- 2022Joe Montana: Cool Under PressureSelf - Narrator (voice)
- 2019The Kelly Clarkson ShowSelf
- 2018All or Nothing: The Michigan WolverinesNarrator (voice)
- 2016The American WestSelf
- 2015The Late Late Show with James CordenSelf
- 2015The Late Show with Stephen ColbertSelf - Guest
- 2014NCIS: New OrleansLeroy Jethro Gibbs
- 2013The Arsenio Hall ShowSelf
- 2012Steve HarveySelf
- 2008The Bonnie Hunt ShowSelf
- 2008Stand Up to CancerSelf
- 2006The Megan Mullally ShowSelf - Guest
- 2004The Tony Danza ShowSelf
- 2003Jimmy Kimmel Live!Self
- 2003NCISLeroy Jethro Gibbs
- 2001The Legend of TarzanBob Markham (voice)
- 2001And Never Let Her GoThomas Capano
- 2000Boston PublicDirector
- 1999The West WingSimon Donovan
- 1999Family GuyLeroy Jethro Gibbs (voice)
- 1998From the Earth to the MoonWally Schirra
- 1997The ViewSelf
- 1996The Rosie O'Donnell ShowSelf
- 1996StrangersMark
- 1995JAGLeroy Jethro Gibbs
- 1995Charlie GraceCharlie Grace
- 1994Chicago HopeJack McNeil
- 1993Harts of the West
- 1992The Tonight Show with Jay Leno
- 1991Reasonable DoubtsDet. Dicky Cobb
- 1986The Deliberate StrangerTed Bundy
- 1985MoonlightingSam Crawford
- 1982St. ElsewhereRobert Caldwell
- 1981Flamingo RoadField Carlyle
- 1981Goliath AwaitsPeter Cabot
- 1981Entertainment TonightSelf
- 1980The Dream MerchantsJohnny Edge
- 1979240-RobertThib Thibideaux
- 1978CentennialCaptain John McIntosh
- 1978SamMike Breen
- 1977The Love BoatDoug Bradbury
- 1977The Hardy Boys / Nancy Drew Mysteries
- 1976Laverne & Shirley
- 1976All's Fair
- 1976DelvecchioRonnie Striker
- 1975Saturday Night LiveSelf - Host
- 1974Police WomanStanski
- 1973Ozzie's Girls
- 1972Emergency!Ofcr. Dave Gordon
- 1968Adam-12Officer Gus Corbin
- 1962The Tonight Show Starring Johnny CarsonSelf
- 1951Hallmark Hall of FameCharles
- 1944Golden Globe AwardsSelf - Nominee
Frequently asked questions
What movies and shows has Mark Harmon been in?
Mark Harmon is best known for Family Guy, NCIS, The West Wing and Saturday Night Live.
When was Mark Harmon born?
Mark Harmon was born on September 2, 1951. (Burbank, California, USA)
How old is Mark Harmon?
Mark Harmon is 75 years old (born September 2, 1951).
Updated: October 29, 2026 ·