Mark Harmon

Mark Harmon

Acting
Born Sep 02, 1951
From Burbank, California, USA

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.

Known For

Filmography — Acting

Freakier Friday
6.9
2025

Freakier Friday

Ryan

Freaky Friday
6.6
2003

Freaky Friday

Ryan

Natural Born Killers
7.1
1994

Natural Born Killers

Mickey Knox in TV

Fear and Loathing in Las Vegas
7.2
1998

Fear and Loathing in Las Vegas

Magazine Reporter

Wyatt Earp
6.8
1994

Wyatt Earp

Sheriff Johnny Behan

Summer School
6.4
1987

Summer School

Mr. Freddy Shoop

Justice League: Crisis on Two Earths
7.3
2010

Justice League: Crisis on Two Earths

Superman (voice)

Crossfire Trail
6.3
2001

Crossfire Trail

Bruce Barkow

Chasing Liberty
6.2
2004

Chasing Liberty

James Foster

The Presidio
5.8
1988

The Presidio

Jay Austin

The Last Supper
6.5
1995

The Last Supper

Dominant Male

Dear America: Letters Home from Vietnam
7.1
1987

Dear America: Letters Home from Vietnam

(voice)

Beyond the Poseidon Adventure
5.1
1979

Beyond the Poseidon Adventure

Larry Simpson

The Deliberate Stranger
6.3
1986

The Deliberate Stranger

Ted Bundy

After the Promise
7.6
1987

After the Promise

Elmer Jackson

Weather Girl
5.6
2009

Weather Girl

Dale

Comes a Horseman
6.1
1978

Comes a Horseman

Billy Joe Meynert

Let's Get Harry
6.1
1986

Let's Get Harry

Harry

NCISverse: The First 1,000
9.0
2024

NCISverse: The First 1,000

Self

Worth Winning
5.2
1989

Worth Winning

Taylor Worth

Stealing Home
6.3
1988

Stealing Home

Billy Wyatt

Sweet Bird of Youth
5.4
1989

Sweet Bird of Youth

Chance Wayne

Original Sins
3.8
1995

Original Sins

Johnathan Franye

Prince of Bel Air
4.7
1986

Prince of Bel Air

Robin Prince

Little Mo
7.5
1978

Little Mo

Norman Brinker

For All Time
6.3
2000

For All Time

Charles Lattimer

Cold Heaven
4.3
1992

Cold Heaven

Alex Davenport

Dillinger
4.7
1991

Dillinger

John Dillinger

Fourth Story
5.0
1991

Fourth Story

David Shepard

Tuareg: Desert Warrior
4.9
1984

Tuareg: Desert Warrior

Gacel Sayah

Certain Prey
4.9
2011

Certain Prey

Lucas Davenport

Magic in the Water
5.3
1995

Magic in the Water

Jack Black

I'll Remember April
6.3
1999

I'll Remember April

John Cooper

Shadow of a Doubt
5.2
1991

Shadow of a Doubt

Charles Spencer

Sonic Boom
4.5
1974

Sonic Boom

Student Controller

4.4
1977

Eleanor and Franklin: The White House Years

Robert Dunlap

Local Boys
6.3
2002

Local Boys

Jim Wesley

Casualties
6.4
1997

Casualties

Tommy Nance

Till There Was You
2.8
1991

Till There Was You

Frank Flynn

Flamingo Road
1980

Flamingo Road

Fielding Carlyle

Intimate Agony
4.3
1983

Intimate Agony

Tommy

And Never Let Her Go
6.6
2001

And Never Let Her Go

Thomas Capano

The Amati Girls
2.5
2001

The Amati Girls

Lawrence

Getting Married
4.0
1978

Getting Married

Howie Lesser

The First to Go
1997

The First to Go

Jeremy Hampton

2002

Intimate Portrait: Pam Dawber

Self

Long Road Home
5.3
1991

Long Road Home

Ertie Robertson

The Wild
7.0
2019

The Wild

Self