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.
also starring Marcus Giamatti
Pirates of Silicon Valley
As Dan Kottke
The Business of Strangers
As Robert
Judy Berlin
As Eddie Dillon
The Chosen One
As Freddy
3 Ninjas Kick Back
As Announcer
Hamlet
As Guildenstern
The Curse of Downers Grove
As Rich
Starving in Suburbia
As Michael
Mr. & Mrs. Bridge
As Gil Davis
Jimmy Hollywood
As BMW Preppie
On the Doll
As Uncle Lou
Blue Lagoon: The Awakening
As Principal Thomas
Necessary Roughness
As Sargie 'Fumblina' Wilkinson
Medium
As Lance Pauling
CSI: Crime Scene Investigation
As Chevy Cigs
Judging Amy
As Peter Gray
Monk
As John Keyes
Cold Case
As Larry Kenick
Crossing Jordan
As Donald Hagen
Life
As Zak Sutter
Quantum Leap
As Rick Upfield
Criminal Minds
As Dr. Barry Landman
Flying Blind
As Ted Sharperson
The X-Files
As John Gillnitz
The Mentalist
As Gabriel Fanning
Hunter
As Jack Kane
Homicide: Life on the Street
Monty
Common Law
Perception
As Joel (Conley's Agent)
The Exes
As Don
NCIS: Los Angeles
As CIA Agent Michael Snyder
House
As Jeffrey Keener
Big Time in Hollywood, Fl
As Detective Jim Zdorkin
Revenge
As Dr. Ray Clemons
Franklin & Bash
CSI: Cyber
As Artie Sneed
Blue Bloods
As Gerry Gertz
Bosch: Legacy
As Simon Wakefield
Get Shorty
NCIS
As Victor Tillman
Dream On
As Salesman
Bones
As Forrest Wakefield
Fringe
As Ray Duffy
Mighty Med
As Sonic Shriek
The Closer
As Glen Lynch
The Defenders
As Lawyer
S.W.A.T.
As Professor Marc Lasky