Marcus Giamatti

Marcus Giamatti is an American actor, best known for being a regular member of the cast of the CBS drama series Judging Amy. He is the younger brother of actor Paul Giamatti.

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Known For

The Mentalist

2008 • as Gabriel Fanning

NCIS

2003 • as Victor Tillman

Criminal Minds

2005 • as Dr. Barry Landman

CSI: Crime Scene Investigation

2000 • as Chevy Cigs

House

2004 • as Jeffrey Keener

Bones

2005 • as Forrest Wakefield

Filmography

2026

Echoes of Tomorrow

as Frank Thompson (segment "Segment #1")

Movie - Released: 7/23/2026

2022

Bosch: Legacy

as Simon Wakefield

TV - Released: 5/5/2022

2017

Get Shorty

TV - Released: 8/13/2017

S.W.A.T.

as Professor Marc Lasky

TV - Released: 11/2/2017

2015

The Curse of Downers Grove

as Rich

Movie - Released: 8/21/2015

Big Time in Hollywood, Fl

as Detective Jim Zdorkin

TV - Released: 3/25/2015

CSI: Cyber

as Artie Sneed

TV - Released: 3/4/2015

2014

Starving in Suburbia

as Michael

Movie - Released: 4/26/2014

2013

Mighty Med

as Sonic Shriek

TV - Released: 10/7/2013

2012

Blue Lagoon: The Awakening

as Principal Thomas

Movie - Released: 6/16/2012

Common Law

as Derek Winfield

TV - Released: 5/11/2012

Perception

as Joel (Conley's Agent)

TV - Released: 7/9/2012

2011

The Exes

as Don

TV - Released: 11/30/2011

Revenge

as Dr. Ray Clemons

TV - Released: 9/21/2011

Franklin & Bash

as Golf Club Owner

TV - Released: 6/1/2011

2010

The Chosen One

as Freddy

Movie - Released: 9/3/2010

Blue Bloods

as Gerry Gertz

TV - Released: 9/24/2010

The Defenders

as Lawyer

TV - Released: 9/22/2010

2009

NCIS: Los Angeles

as CIA Agent Michael Snyder

TV - Released: 9/22/2009

Lie to Me

as Fentris

TV - Released: 1/21/2009

2008

The Mentalist

as Gabriel Fanning

TV - Released: 9/23/2008

Fringe

as Ray Duffy

TV - Released: 9/9/2008

2007

On the Doll

as Uncle Lou

Movie - Released: 10/12/2007

Life

as Zak Sutter

TV - Released: 9/26/2007

2005

Medium

as Lance Pauling

TV - Released: 1/3/2005

Criminal Minds

as Dr. Barry Landman

TV - Released: 9/22/2005

Bones

as Forrest Wakefield

TV - Released: 9/13/2005

The Closer

as Glen Lynch

TV - Released: 6/13/2005

2004

House

as Jeffrey Keener

TV - Released: 11/16/2004

2003

Cold Case

as Larry Kenick

TV - Released: 9/28/2003

NCIS

as Victor Tillman

TV - Released: 9/23/2003

2002

Monk

as John Keyes

TV - Released: 7/12/2002

CSI: Miami

as Hugh Parker

TV - Released: 9/23/2002

2001

The Business of Strangers

as Robert

Movie - Released: 9/13/2001

Crossing Jordan

as Donald Hagen

TV - Released: 9/24/2001

2000

Hamlet

as Guildenstern

Movie - Released: 12/10/2000

CSI: Crime Scene Investigation

as Chevy Cigs

TV - Released: 10/6/2000

1999

Pirates of Silicon Valley

as Dan Kottke

Movie - Released: 6/20/1999

Judy Berlin

as Eddie Dillon

Movie - Released: 10/6/1999

Judging Amy

as Peter Gray

TV - Released: 9/19/1999

1994

3 Ninjas Kick Back

as Announcer

Movie - Released: 2/25/1994

Jimmy Hollywood

as BMW Preppie

Movie - Released: 3/30/1994

Monty

TV - Released: 1/11/1994

1993

The X-Files

as John Gillnitz

TV - Released: 9/10/1993

Homicide: Life on the Street

as Bernard Abrams

TV - Released: 1/31/1993

Living Single

as Jack Peabody

TV - Released: 8/29/1993

1992

Flying Blind

as Ted Sharperson

TV - Released: 9/13/1992

1991

Necessary Roughness

as Sargie 'Fumblina' Wilkinson

Movie - Released: 9/27/1991

Aftermath: A Test of Love

as Luke

Movie - Released: 3/10/1991

1990

Mr. & Mrs. Bridge

as Gil Davis

Movie - Released: 11/23/1990

Dream On

as Salesman

TV - Released: 7/8/1990

1989

Quantum Leap

as Rick Upfield

TV - Released: 3/26/1989

1984

Hunter

as Jack Kane

TV - Released: 9/18/1984

Unknown

Is It Time?

as Frank

Movie