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Mark Harmon

Acting

Born September 2, 1951 · Burbank, California, USA

Also known as Thomas Mark Harmon

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.

Awards & recognition

  • star on Hollywood Walk of Fame
  • Primetime Emmy AwardOutstanding Guest Actor in a Drama Series · 2002 · nominated
  • Screen Actors Guild AwardOutstanding Performance by an Ensemble in a Drama Series · 1998 · nominated
  • Screen Actors Guild AwardOutstanding Performance by an Ensemble in a Drama Series · 1997 · nominated

Filmography50+ titles

Joe Montana: Cool Under Pressure

2022as Self - Narrator (voice)

The West Wing

1999as Simon Donovan

From the Earth to the Moon

1998as Wally Schirra

Emergency!

1972as Ofcr. Dave Gordon

NCIS: Origins

2024as Older Leroy Jethro Gibbs (voice) (uncredited)

NCIS

2003as Leroy Jethro Gibbs

After the Promise

1987as Elmer Jackson

Moonlighting

1985as Sam Crawford

The Tonight Show Starring Johnny Carson

1962as Self

All or Nothing: The Michigan Wolverines

as Narrator (voice)

Family Guy

1999as Leroy Jethro Gibbs (voice)

NCIS: New Orleans

2014as Leroy Jethro Gibbs

Justice League: Crisis on Two Earths

2010as Superman (voice)

JAG

1995as Leroy Jethro Gibbs

Fear and Loathing in Las Vegas

1998as Magazine Reporter

Laverne & Shirley

1976

Natural Born Killers

1994as Mickey Knox in TV

The Hardy Boys/Nancy Drew Mysteries

1977

Adam-12

1968as Officer Gus Corbin

And Never Let Her Go

as Thomas Capano

Saturday Night Live

1975as Self - Host

Freakier Friday

2025as Ryan

Casualties

1997as Tommy Nance

Wyatt Earp

1994as Sheriff Johnny Behan

Harts of the West

The American West

2016as Self

Freaky Friday

2003as Ryan

I'll Remember April

1999as John Cooper

The Last Supper

1995as Dominant Male

The Kelly Clarkson Show

2019as Self

Local Boys

2002as Jim Wesley

Summer School

1987as Mr. Freddy Shoop

Police Woman

1974as Stanski

Crossfire Trail

2001as Bruce Barkow

Stealing Home

1988as Billy Wyatt

The Love Boat

1977as Doug Bradbury

Chasing Liberty

2004as James Foster

The Late Show with Stephen Colbert

2015as Self - Guest

Comes a Horseman

1978as Billy Joe Meynert

The Presidio

1988as Jay Austin

St. Elsewhere

1982as Robert Caldwell

Weather Girl

2009as Dale

Sweet Bird of Youth

1989as Chance Wayne

Jimmy Kimmel Live!

2003as Self

Magic in the Water

1995as Jack Black

Tuareg: Desert Warrior

1984as Gacel Sayah

Beyond the Poseidon Adventure

1979as Larry Simpson

Prince of Bel Air

1986as Robin Prince

Intimate Agony

1983as Tommy

Certain Prey

2011as Lucas Davenport