Peter Killian Gallagher (born August 19, 1955) is an American actor. He is best known for his roles in the films Sex, Lies, and Videotape (1989), American Beauty (1999), and Palm Springs (2020).

KNOWN FOR

Law & Order: Special Victims Unit
2014
Grey's Anatomy
2021
Family Guy
2001
The View
2004
The Late Late Show with Craig Ferguson
2005
LIVE with Kelly and Mark
2005
The Good Wife
2015
How I Met Your Mother
2012
Late Night with Conan O'Brien
1993
The Ellen DeGeneres Show
2005
The Tamron Hall Show
2020
New Girl
2016

FILMOGRAPHY

All
Movies
TV
Acting
142
Writing
1
2026
TOVAH
as Self
2025
Everybody's Live with John Mulaney
as Future John Mulaney
2024
Humane
as Charles York
2023
Truth Be Told
as Andrew Finney
2023
The Owl House
as Del Clawthorne (voice)
2022
The Day the Music Died: The Story of Don McLean's "American Pie"
as Self
2022
Mr. Mayor
as Brett (uncredited)
2022
Reboot
as Tyler
2021
Zoey's Extraordinary Christmas
as Mitch Clarke
2021
One December Night
as Mike
2021
Grey's Anatomy
as David Hamilton
2020
Palm Springs
as Howard
2020
One Night Only: The Best of Broadway
as Self
2020
The Tamron Hall Show
as Self - Guest
2020
Stars in the House
as Self
2020
Zoey's Extraordinary Playlist
as Mitch Clarke
2019
After
as Ken Scott
2019
Stepdaddy
2019
The Conners
as Brian Foster
2018
Something in the Air: Making "sex, lies, and videotape"
as Self
2018
Submission
as Len
2018
The Gifted
as Benedict Ryan
2017
Literally, Right Before Aaron
as Orson Schwartzman
2017
A Bad Moms Christmas
as Hank
2017
Grace and Frankie
as Nick Skolka
2017
Man Seeking Woman
as Joel Greenberg
2016
Center Stage: On Pointe
as Jonathan Reeves
2016
Cruel Intentions
as Edward Valmont
2016
New Girl
as Gavin
2015
Hello, My Name Is Doris
as Willy Williams
2015
In a Relationship
as The Interviewer (voice)
2015
DeTour
as Professor Zaring
2015
Togetherness
as Larry
2015
The Good Wife
as Ethan Carver
2014
Law & Order: Special Victims Unit
as William Dodds
2012
Someday This Pain Will Be Useful to You
as Paul Sveck
2012
Step Up Revolution
as Bill Anderson
2012
How I Met Your Mother
as Professor Vinick
2011
Whitney
as Vince
2010
Burlesque
as Vince Scali
2010
GasHole
as Narrator (voice)
2010
Conviction
as Barry Scheck
2010
Covert Affairs
as Arthur Campbell
2009
Adam
as Marty Buchwald
2009
The War Boys
as Slater
2009
Californication
as Dean Stacy Koons
2008
Center Stage: Turn It Up
as Jonathan Reeves
2008
Shark
as Frank Bell
2007
The Gathering
as Dr. Michael Foster
2006
The Megan Mullally Show
as Self - Guest
2005
The Ellen DeGeneres Show
as Self - Guest
2005
LIVE with Kelly and Mark
as Self
2005
Good Day Live
as Self
2005
The Late Late Show with Craig Ferguson
as Self
2004
Broadway's Lost Treasures II
as Sky Masterson (segment "Guys & Dolls")
2004
The Tony Danza Show
as Self
2004
The View
as Self
2004
On Air with Ryan Seacrest
as Self - The O.C.
2003
The Adventures of Tom Thumb and Thumbelina
as The Mole King (voice)
2003
How to Deal
as Len Martin
2003
Comedy Central Roast of Denis Leary
as Self
2003
A Tale of Two Wives
as Bill Goodman
2003
The O.C.
as Sandy Cohen
2003
Comedy Central Roasts
as Self
2002
Mr. Deeds
as Chuck Cedar
2002
Page to Screen: 'The Silence of the Lambs'
as Host
2002
Magic Time: A Tribute to Jack Lemmon
as Self
2002
Page to Screen
2001
Protection
as Ted
2001
Perfume
as Guido
2001
Feast of All Saints
as Philippe Ferronaire
2001
My Favorite Broadway: The Love Songs
as Self
2001
Family Guy
as Jared (voice)
2000
Center Stage
as Jonathan Reeves
2000
Other Voices
as Jordin
2000
Jesus Christ Superstar
as First Priest
2000
The Last Debate
as Tom Chapman
2000
American Beauty: Look Closer...
as Self
2000
Cupid & Cate
as Harry
2000
Hallmark Hall of Fame
as Harry
1999
American Beauty
as Buddy Kane
1999
House on Haunted Hill
as Donald W. Blackburn, M.D.
1999
Brotherhood of Murder
as Bob Matthews
1998
Brave New World
as Bernard Marx
1998
Virtual Obsession
as Dr. Joe Messenger
1998
Johnny Skidmarks
as Johnny Scardino
1998
Superman: The Animated Series
as Kurt (voice)
1998
Homicide: Life on the Street
as Chris Rawls
1998
The Secret Lives of Men
1997
The Man Who Knew Too Little
as James Ritchie
1997
Path to Paradise: The Untold Story of the World Trade Center Bombing
as John Anticev
1997
Cafe Society
as Jack Kale
1997
The Trial of Adolf Eichmann
as Gideon Hausner (voice)
1996
To Gillian on Her 37th Birthday
as David Lewis
1996
Last Dance
as John Hayes
1996
The Great Irish Famine
as narrator
1996
Cannes Man
as Self
1996
Titanic
as Wynn Park
1995
While You Were Sleeping
as Peter Callaghan
1995
The Underneath
as Michael Chambers
1995
Tony Awards
as Self - Performer
1994
Mrs. Parker and the Vicious Circle
as Alan Campbell
1994
White Mile
as Jack Robbins
1994
Everybody Just Stay Calm
as Self
1994
The Hudsucker Proxy
as Vic Tenetta
1993
Short Cuts
as Stormy Weathers
1993
Malice
as Atty. Dennis Riley
1993
Mother's Boys
as Robert Madigan
1993
Watch It
as John
1993
Luck, Trust & Ketchup: Robert Altman in Carver Country
as Self
1993
Late Night with Conan O'Brien
as Self - Guest
1993
Fallen Angels
as Mitch Allison
1993
Fallen Angels
as Dr. Yorgrau
1992
The Player
as Larry Levy
1992
Buying a Landslide
as Philip Kautsky
1992
Bob Roberts
as Dan Riley
1992
Robert Altman's Players
as Self
1992
Guys and Dolls: Off the Record
as Himself / Sky Masterson
1991
The Cabinet of Dr. Ramirez
as Matt
1991
Milena
as Pollak
1991
Late for Dinner
as Bob Freeman
1991
An Inconvenient Woman
as Philip Quennell
1990
Love and Lies
as David West
1990
Tune in Tomorrow...
as Richard Quince
1989
sex, lies, and videotape
as John Mullany
1988
High Spirits
as Brother Tony
1988
The Caine Mutiny Court-Martial
as Lt. Cmdr. John Challee
1988
I'll Be Home for Christmas
as Aaron Copler
1988
The Murder of Mary Phagan
as Leo Frank
1988
American Playhouse
as Charles Castle
1987
Long Day's Journey Into Night
as Edmund Tyrone
1986
My Little Girl
as Kai
1985
Dreamchild
as Jack Dolan
1984
Terrible Joe Moran
as Nick
1982
Summer Lovers
as Michael Pappas
1982
American Playhouse
as Logan Melton
1980
The Idolmaker
as Caesare
1980
Skag
as John Skagska
1980
Skag
Broadway: The Next Generation
as Self
New Line: Independent Legacies
as Self (archive footage)
Cruel Intentions
as Edward Valmont