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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.

Bosch: Legacy
as Simon Wakefield

S.W.A.T.
as Professor Marc Lasky

Get Shorty

The Curse of Downers Grove
as Rich

Big Time in Hollywood, Fl
as Detective Jim Zdorkin

CSI: Cyber
as Artie Sneed

Starving in Suburbia
as Michael

Mighty Med
as Sonic Shriek

Perception
as Joel (Conley's Agent)

Blue Lagoon: The Awakening
as Principal Thomas

Common Law

The Exes
as Don

Revenge
as Dr. Ray Clemons

Franklin & Bash
as Golf Club Owner

Blue Bloods
as Gerry Gertz

The Defenders
as Lawyer

The Chosen One
as Freddy

NCIS: Los Angeles
as CIA Agent Michael Snyder

Lie to Me
as Fentris

The Mentalist
as Gabriel Fanning

Fringe
as Ray Duffy

On the Doll
as Uncle Lou

Life
as Zak Sutter

Criminal Minds
as Dr. Barry Landman

Bones
as Forrest Wakefield

The Closer
as Glen Lynch

Medium
as Lance Pauling

House
as Jeffrey Keener

Cold Case
as Larry Kenick

NCIS
as Victor Tillman

CSI: Miami
as Hugh Parker

Monk
as John Keyes

Crossing Jordan
as Donald Hagen

The Business of Strangers
as Robert

Hamlet
as Guildenstern

CSI: Crime Scene Investigation
as Chevy Cigs

Judy Berlin
as Eddie Dillon

Judging Amy
as Peter Gray

Pirates of Silicon Valley
as Dan Kottke

Jimmy Hollywood
as BMW Preppie

3 Ninjas Kick Back
as Announcer

Monty

The X-Files
as John Gillnitz

Living Single
as Jack Peabody

Homicide: Life on the Street
as Bernard Abrams

Flying Blind
as Ted Sharperson

Necessary Roughness
as Sargie 'Fumblina' Wilkinson

Aftermath: A Test of Love
as Luke

Mr. & Mrs. Bridge
as Gil Davis

Dream On
as Salesman

Quantum Leap
as Rick Upfield

Hunter
as Jack Kane

Is It Time?
as Frank