Marcus Giamatti
Acting
53
Acting Credits
Biography
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.
Known For
Filmography
Echoes of Tomorrow
2026
as Frank Thompson (segment "Segment #1")
Bosch: Legacy
2022
as Simon Wakefield
Get Shorty
2017
S.W.A.T.
2017
as Professor Marc Lasky
The Curse of Downers Grove
2015
as Rich
Big Time in Hollywood, Fl
2015
as Detective Jim Zdorkin
CSI: Cyber
2015
as Artie Sneed
Starving in Suburbia
2014
as Michael
Mighty Med
2013
as Sonic Shriek
Blue Lagoon: The Awakening
2012
as Principal Thomas
Common Law
2012
as Derek Winfield
Perception
2012
as Joel (Conley's Agent)
The Exes
2011
as Don
Revenge
2011
as Dr. Ray Clemons
Franklin & Bash
2011
as Golf Club Owner
The Chosen One
2010
as Freddy
Blue Bloods
2010
as Gerry Gertz
The Defenders
2010
as Lawyer
NCIS: Los Angeles
2009
as CIA Agent Michael Snyder
Lie to Me
2009
as Fentris
The Mentalist
2008
as Gabriel Fanning
Fringe
2008
as Ray Duffy
On the Doll
2007
as Uncle Lou
Life
2007
as Zak Sutter
Medium
2005
as Lance Pauling
Criminal Minds
2005
as Dr. Barry Landman
Bones
2005
as Forrest Wakefield
The Closer
2005
as Glen Lynch
House
2004
as Jeffrey Keener
Cold Case
2003
as Larry Kenick
NCIS
2003
as Victor Tillman
Monk
2002
as John Keyes
CSI: Miami
2002
as Hugh Parker
The Business of Strangers
2001
as Robert
Crossing Jordan
2001
as Donald Hagen
Hamlet
2000
as Guildenstern
CSI: Crime Scene Investigation
2000
as Chevy Cigs
Pirates of Silicon Valley
1999
as Dan Kottke
Judy Berlin
1999
as Eddie Dillon
Judging Amy
1999
as Peter Gray
3 Ninjas Kick Back
1994
as Announcer
Jimmy Hollywood
1994
as BMW Preppie
Monty
1994
The X-Files
1993
as John Gillnitz
Homicide: Life on the Street
1993
as Bernard Abrams
Living Single
1993
as Jack Peabody
Flying Blind
1992
as Ted Sharperson
Necessary Roughness
1991
as Sargie 'Fumblina' Wilkinson
Aftermath: A Test of Love
1991
as Luke
Mr. & Mrs. Bridge
1990
as Gil Davis
Dream On
1990
as Salesman
Quantum Leap
1989
as Rick Upfield
Hunter
1984
as Jack Kane