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Marcus Giamatti's feature film credits include "Hamlet," "Business of Strangers," "Mr. & Mrs. Bridge," "Necessary Roughness," "Judy Berlin," "Jimmy Hollywood" and "3 Ninjas Kick Back."

Among his television credits are the films "The Pirates of Silicon Valley," "Path to Paradise" and "Aftermath: A Test of Love" and the series "Flying Blind." He has also guest-starred in "Cosby," on CBS, "The X-Files," "Dream On," "Living Single," "Homicide: Life on the Street," "Wild Oats" and the daytime drama "One Life to Live."

Giamatti is a graduate of the Yale School of Drama, where he received the Carole Dye Award for Excellence in Acting. His extensive theater credits include the Broadway production of "The Young Man from Atlanta" and "Measure for Measure" at New York's Lincoln Center. He has also appeared Off Broadway in "Italian American Reconciliation," "Durang, Durang" and "Century City" and in regional productions of "Once in a Lifetime," "Macbeth," "She Stoops to Conquer," "Misalliance," "The Miser," "Union Boys" and "Othello." He has also developed new plays at the Eugene O'Neill National Playwrights Conference in Connecticut.

An accomplished musician, Giamatti plays bass guitar in several bands in Los Angeles, including the alternative folk-rock group Olivea and the psychedelic jam band Rebel Soul. He is also a session musician and is a member of Musicians Local 47.

Giamatti was born in New Haven, Connecticut, and lives in Los Angeles. His birth date is October 3.

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Amy Brenneman

as Amy Gray

Tyne Daly

as Maxine Gray

Dan Futterman

as Vincent Gray

Richard T. Jones

as Bruce Van Exel

Marcus Giamatti

as Peter Gray

Jessica Tuck

as Gillian Gray

Karle Warren

as Lauren Cassidy

Jillian Armenante

as Donna Kozlowski

Timothy Omundson

as Sean Potter