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Personal Info

Known For

Acting

Known Credits

106

Gender

Male

Birthday

1951-09-02 (74 years old)

Place of Birth

Burbank, California, USA

Also Known As

Thomas Mark Harmon

مارک هارمون

مارک هارمُن

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.

Known For

Acting

Getting Married

1978

Getting Married

as

Howie Lesser

Fear and Loathing in Las Vegas

1998

Fear and Loathing in Las Vegas

as

Magazine Reporter

Freaky Friday

2003

Freaky Friday

as

Ryan

Original Sins

1995

Original Sins

as

Johnathan Franye

Justice League: Crisis on Two Earths

2010

Justice League: Crisis on Two Earths

as

Clark Kent / Superman (voice)

The Presidio

1988

The Presidio

as

Jay Austin

Magic in the Water

1995

Magic in the Water

as

Jack Black

Wyatt Earp

1994

Wyatt Earp

as

Sheriff Johnny Behan

Worth Winning

1989

Worth Winning

as

Taylor Worth

Stealing Home

1988

Stealing Home

as

Billy Wyatt

The Last Supper

1995

The Last Supper

as

Dominant Male

Crossfire Trail

2001

Crossfire Trail

as

Bruce Barkow

Comes a Horseman

1978

Comes a Horseman

as

Billy Joe Meynert

Summer School

1987

Summer School

as

Mr. Freddy Shoop

Local Boys

2002

Local Boys

as

Jim Wesley

Weather Girl

2009

Weather Girl

as

Dale

Sweet Bird of Youth

1989

Sweet Bird of Youth

as

Chance Wayne

After the Promise

1987

After the Promise

as

Elmer Jackson

Certain Prey

2011

Certain Prey

as

Lucas Davenport

Tuareg: Desert Warrior

1984

Tuareg: Desert Warrior

as

Gacel Sayah

And Never Let Her Go

2001

And Never Let Her Go

as

Thomas Capano

Cold Heaven

1992

Cold Heaven

as

Alex Davenport

Prince of Bel Air

1986

Prince of Bel Air

as

Robin Prince

For All Time

2000

For All Time

as

Charles Lattimer

Intimate Agony

1983

Intimate Agony

as

Tommy

Shadow of a Doubt

1991

Shadow of a Doubt

as

Charles Spencer

Dillinger

1991

Dillinger

as

John Dillinger

Long Road Home

1991

Long Road Home

as

Ertie Robertson

Casualties

1997

Casualties

as

Tommy Nance

Till There Was You

1991

Till There Was You

as

Frank Flynn

Let's Get Harry

1986

Let's Get Harry

as

Harry

Flamingo Road

1980

Flamingo Road

as

Fielding Carlyle

Fourth Story

1991

Fourth Story

as

David Shepard

Little Mo

1978

Little Mo

as

Norman Brinker

Freakier Friday

2025

Freakier Friday

as

Ryan

Natural Born Killers

1994

Natural Born Killers

as

Mickey Knox in TV

The First to Go

1997

The First to Go

as

Jeremy Hampton

Sonic Boom

1974

Sonic Boom

as

Student Controller

The Wild

2019

The Wild

as

Self

I'll Remember April

1999

I'll Remember April

as

John Cooper

Chasing Liberty

2004

Chasing Liberty

as

James Foster

The Amati Girls

2001

The Amati Girls

as

Lawrence

St. Elsewhere

St. Elsewhere

as

Robert Caldwell

The Love Boat

The Love Boat

as

Doug Bradbury

The Legend of Tarzan

The Legend of Tarzan

as

Bob Markham (voice)

Moonlighting

Moonlighting

as

Sam Crawford

The View

The View

as

Self

240-Robert

240-Robert

as

Thib Thibideaux

NCIS

NCIS

as

Leroy Jethro Gibbs

JAG

JAG

as

Leroy Jethro Gibbs

Centennial

Centennial

as

Captain John McIntosh

Chicago Hope

Chicago Hope

as

Jack McNeil

Reasonable Doubts

Reasonable Doubts

as

Det. Dicky Cobb

Sam

Sam

as

Mike Breen

Charlie Grace

Charlie Grace

as

Charlie Grace

The Dream Merchants

The Dream Merchants

as

Johnny Edge

Saturday Night Live

Saturday Night Live

as

Self - Host

The West Wing

The West Wing

as

Simon Donovan

Adam-12

Adam-12

as

Officer Gus Corbin

Goliath Awaits

Goliath Awaits

as

Peter Cabot

Police Woman

Police Woman

as

Stanski

NCIS: New Orleans

NCIS: New Orleans

as

Leroy Jethro Gibbs

Delvecchio

Delvecchio

as

Ronnie Striker

Family Guy

Family Guy

as

Leroy Jethro Gibbs (voice)

And Never Let Her Go

And Never Let Her Go

as

Thomas Capano

Joe Montana: Cool Under Pressure

Joe Montana: Cool Under Pressure

as

Self - Narrator (voice)

Golden Globe Awards

Golden Globe Awards

as

Self - Nominee

NCIS: Origins

NCIS: Origins

as

Older Leroy Jethro Gibbs (uncredited)

NCIS: Origins

NCIS: Origins

as

Older Leroy Jethro Gibbs (voice) (uncredited)

Emergency!

Emergency!

as

Ofcr. Dave Gordon

Police Woman

Police Woman

as

Paul Donin

Production

Crew

Directing