Mark Harmon

Known For	Acting
Birthday	Sep 02, 1951 (74)
Birthplace	Burbank, California, USA
Popularity	2 (history)
Updated	Aug 09, 2025
Entry Date	Apr 13, 2024
Links	TMDb IMDb

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 201 ... 7. 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

Headshots

Filmography

Freakier Friday

2025

as Ryan

Certain Prey

2011

as Lucas Davenport

Justice League: Crisis on Two Earths

2010

as Clark Kent / Superman (voice)

Weather Girl

2009

as Dale

Chasing Liberty

2004

as James Foster

Freaky Friday

2003

as Ryan

Local Boys

2002

as Jim Wesley

And Never Let Her Go

2001

as Thomas Capano

Crossfire Trail

2001

as Bruce Barkow

The Amati Girls

2001

as Lawrence

For All Time

2000

as Charles Lattimer

I'll Remember April

1999

as John Cooper

Fear and Loathing in Las Vegas

1998

as Magazine Reporter

Casualties

1997

as Tommy Nance

The First to Go

1997

as Jeremy Hampton

Original Sins

1995

as Johnathan Franye

Magic in the Water

1995

as Jack Black

The Last Supper

1995

as Dominant Male

Wyatt Earp

1994

as Sheriff Johnny Behan

Natural Born Killers

1994

as Mickey Knox in TV

Cold Heaven

1992

as Alex Davenport

Long Road Home

1991

as Ertie Robertson

Till There Was You

1991

as Frank Flynn

Dillinger

1991

as John Dillinger

Shadow of a Doubt

1991

as Charles Spencer

Fourth Story

1991

as David Shepard

Worth Winning

1989

as Taylor Worth

Sweet Bird of Youth

1989

as Chance Wayne

Stealing Home

1988

as Billy Wyatt

The Presidio

1988

as Jay Austin

After the Promise

1987

as Elmer Jackson

Summer School

1987

as Mr. Freddy Shoop

Dear America: Letters Home from Vietnam

1987

as (voice)

The Deliberate Stranger

1986

as Ted Bundy

Prince of Bel Air

1986

as Robin Prince

Let's Get Harry

1986

as Harry

Intimate Agony

1983

as Tommy

Flamingo Road

1980

as Fielding Carlyle

Beyond the Poseidon Adventure

1979

as Larry Simpson

Getting Married

1978

as Howie Lesser

Comes a Horseman

1978

as Billy Joe Meynert

Little Mo

1978

as Norman Brinker

Eleanor and Franklin: The White House Years

1977

as Robert Dunlap

Sonic Boom

1974

as Student Controller

No data available

Certain Prey

2011

Executive Producer

Organization	Category	Movie

NCIS

as Leroy Jethro Gibbs

Episodes: 435

First Aired: Sep 23, 2003

Chicago Hope

as Jack McNeil

Episodes: 96

First Aired: Sep 18, 1994

St. Elsewhere

as Robert Caldwell

Episodes: 70

First Aired: Oct 26, 1982

Reasonable Doubts

as Det. Dicky Cobb

Episodes: 44

First Aired: Sep 26, 1991

240-Robert

as Thib Thibideaux

Episodes: 13

First Aired: Aug 28, 1979

Centennial

as Captain John McIntosh

Episodes: 12

First Aired: Oct 01, 1978

Charlie Grace

as Charlie Grace

Episodes: 9

First Aired: Sep 14, 1995

All or Nothing: The Michigan Wolverines

as Narrator (voice)

Episodes: 8

First Aired: Apr 06, 2018

Sam

as Mike Breen

Episodes: 6

First Aired: Mar 14, 1978

Moonlighting

as Sam Crawford

Episodes: 4

First Aired: Mar 03, 1985

The West Wing

as Simon Donovan

Episodes: 4

First Aired: Sep 22, 1999

NCIS: New Orleans

as Leroy Jethro Gibbs

Episodes: 4

First Aired: Sep 23, 2014

The Love Boat

as Doug Bradbury

Episodes: 3

First Aired: Sep 24, 1977

The Dream Merchants

as Johnny Edge

Episodes: 3

First Aired: May 12, 1980

JAG

as Leroy Jethro Gibbs

Episodes: 2

First Aired: Sep 23, 1995

Goliath Awaits

as Peter Cabot

Episodes: 2

First Aired: Nov 11, 1981

And Never Let Her Go

as Thomas Capano

Episodes: 2

First Aired: Apr 01, 2001

The Legend of Tarzan

as Bob Markham (voice)

Episodes: 1

First Aired: Sep 03, 2001

From the Earth to the Moon

as Wally Schirra

Episodes: 1

First Aired: Apr 05, 1998

Hallmark Hall of Fame

as Charles

Episodes: 1

First Aired: Dec 24, 1951

Adam-12

as Officer Gus Corbin

Episodes: 1

First Aired: Sep 21, 1968

Police Woman

as Stanski

Episodes: 1

First Aired: Sep 13, 1974

Delvecchio

as Ronnie Striker

Episodes: 1

First Aired: Sep 09, 1976

Family Guy

as Leroy Jethro Gibbs (voice)

Episodes: 1

First Aired: Jan 31, 1999

NCIS: Origins

as Older Leroy Jethro Gibbs (uncredited)

Episodes: 1

First Aired: Oct 14, 2024

NCIS: Origins

as Older Leroy Jethro Gibbs (voice) (uncredited)

Episodes: 1

First Aired: Oct 14, 2024

Emergency!

as Ofcr. Dave Gordon

Episodes: 1

First Aired: Jan 22, 1972

Flamingo Road

Episodes: 37

First Aired: Jan 06, 1981

The American West

as Self

Episodes: 8

First Aired: Jun 11, 2016

Joe Montana: Cool Under Pressure

as Self - Narrator (voice)

Episodes: 6

First Aired: Jan 06, 2022

Golden Globe Awards

as Self - Nominee

Episodes: 3

First Aired: Jan 20, 1944

Laverne & Shirley

Episodes: 2

First Aired: Jan 27, 1976

The Tony Danza Show

as Self

Episodes: 1

First Aired: Sep 13, 2004

Jimmy Kimmel Live!

Episodes: 1

First Aired: Jan 26, 2003

The Rosie O'Donnell Show

as Self

Episodes: 1

First Aired: Jun 10, 1996

The View

as Self

Episodes: 1

First Aired: Aug 11, 1997

The Tonight Show with Jay Leno

Episodes: 1

First Aired: May 25, 1992

The Hardy Boys / Nancy Drew Mysteries

Episodes: 1

First Aired: Jan 30, 1977

All's Fair

Episodes: 1

First Aired: Sep 20, 1976

Police Woman

Episodes: 1

First Aired: Sep 13, 1974

Harts of the West

Episodes: 1

First Aired: Sep 25, 1993

Ozzie's Girls

Episodes: 1

First Aired: Sep 15, 1973

The Bonnie Hunt Show

Episodes: 1

First Aired: Sep 08, 2008

Saturday Night Live

as Self - Host

Episodes: 1

First Aired: Oct 11, 1975

The Late Late Show with James Corden

as Self

Episodes: 1

First Aired: Mar 23, 2015

The Kelly Clarkson Show

as Self

Episodes: 1

First Aired: Sep 09, 2019

The Tonight Show Starring Johnny Carson

as Self

Episodes: 1

First Aired: Oct 01, 1962

The Arsenio Hall Show

as Self

Episodes: 1

First Aired: Sep 09, 2013

Entertainment Tonight

as Self

Episodes: 1

First Aired: Sep 15, 1981

The Megan Mullally Show

as Self - Guest

Episodes: 1

First Aired: Sep 18, 2006

Golden Globe Awards

as Self

Episodes: 1

First Aired: Jan 20, 1944

Popularity Metrics

Popularity History

Year	Month	Avg	Max	Min
2024	6	53	87	33
2024	7	42	54	23
2024	8	45	67	25
2024	9	39	57	27
2024	10	36	50	21
2024	11	34	42	23
2024	12	28	37	17
2025	1	32	50	20
2025	2	22	34	4
2025	3	18	39	1
2025	4	12	13	10
2025	5	14	16	12
2025	6	10	14	8
2025	7	6	8	2
2025	8	3	6	1
2025	9	2	2	1
2025	10	1	2	1

Trending Rank

Year	Month	Avg Rank	Max Rank
2024	6	595	287
2025	3	555	505
2025	6	451	418
2025	7	320	83
2025	9	872	655

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Mark Harmon

Biography

Known For

Headshots

Filmography

Television Credits

Popularity Metrics