William Atherton Knight Jr. (born July 30, 1947) is an American actor, best known for portraying Richard Thornburg in Die Hard and its sequel and Walter Peck in Ghostbusters.

KNOWN FOR

Law & Order: Special Victims Unit
2010
Law & Order
2002
Castle
2011
Desperate Housewives
2006
Lost
2010
Stargate SG-1
2006
Monk
2008
The Practice
1997
The Outer Limits
1998
Murder, She Wrote
1985
Boston Legal
2005
Numb3rs
2007

FILMOGRAPHY

All
Movies
TV
Acting
94
Producing
1
2025
Where Did the Adults Go?
as The Father
2024
Ghostbusters: Frozen Empire
as Mayor Walter Peck
2020
Cleanin' Up the Town: Remembering Ghostbusters
as Self
2020
Reunited Apart
as Self
2018
Bad Company
2017
Clinical
as Terry Drummond
2016
Ghostheads
as Self
2014
Jinn
as Father Westhoff
2013
Childrens Hospital
as Levon Bainter
2012
Tim and Eric's Billion Dollar Movie
as Earle Swinter
2012
Jersey Shore Shark Attack
as Dolan
2012
The Citizen
2012
Workaholics
as Thor Holmvik
2011
Castle
as Ari Weiss
2010
The Kane Files: Life of Trial
as Daniel Morgan
2010
Lost
as Donald Reynolds
2010
Law & Order: Special Victims Unit
as Ned Bogden
2008
Aces 'N' Eights
as Howard
2008
Ghouls
as Stefan
2008
Black Crescent Moon
as Jo Dexton
2008
Monk
as Commander Nathan Whitaker
2008
Life
as Mickey Rayborn
2007
Kush
as King
2007
The Girl Next Door
as Adult David Moran
2007
Towards Darkness
as John
2007
Numb3rs
as Warren Pierce
2006
Desperate Housewives
as Dr. Barr
2006
Stargate SG-1
as Emissary Varta
2005
Into the Sun
as Agent Block
2005
Headspace
as Dr. Ira Gold
2005
Gone But Not Forgotten
as Sen. Ray Colby
2005
Boston Legal
as A.D.A. Howard Zale
2004
Who's Your Daddy?
as Duncan Mack
2004
Law & Order
as Dan Jensen
2003
The Last Samurai
as Winchester Rep
2003
Justice League
as Dr. Destiny / John Dee (voice)
2002
Law & Order
as Don Snyder
2001
Race to Space
as Ralph Stanton
2001
Burning Down the House
as Arthur Kranston
2001
Night Visions
as William Price (segment "Hate Puppet")
2000
The Crow: Salvation
as Nathan Randall
2000
Bread and Roses
as Party Guest (uncredited)
1999
Introducing Dorothy Dandridge
as Darryl Zanuck
1999
The Stranger
1998
Michael Kael vs. the World News Company
as James Denit
1998
The Outer Limits
as Franklin Murdoch
1997
Mad City
as Dohlen
1997
Executive Power
as President Fields
1997
Hoodlum
as Thomas E. Dewey
1997
The Practice
as Keith Pratt
1996
Bio-Dome
as Dr. Noah Faulkner
1996
Raven Hawk
as Philip Thorne
1996
Nash Bridges
as Dr. Linus Mills
1995
Broken Trust
as Neil Roemer
1995
A Night to Die For
as Self
1995
Virus
as Dr. Reginald Holloway
1994
Frank & Jesse
as Allan Pinkerton
1994
Saints and Sinners
as Terence
1993
The Pelican Brief
as Bob Gminski
1992
Chrome Soldiers
as Sheriff Blackwell
1992
Diagnosis Murder: Diagnosis of Murder
as Eric Walker
1992
HBO First Look
1991
Oscar
as Overton
1991
Tales from the Crypt
as Malcolm Mayflower
1991
Murder, She Wrote
as Andy Henley
1990
Die Hard 2
as Richard Thornberg
1990
Buried Alive
as Cort van Owen
1990
Grim Prairie Tales
as Arthur
1990
Max Monroe: Loose Cannon
as Sloane
1989
The Equalizer
as Gideon
1988
Die Hard
as Richard Thornburg
1988
Intrigue
as Doggett
1987
The Equalizer - The Movie: Blood & Wine
as Martin 'Alpha' Loeber
1987
The Equalizer
as Martin 'Alpha' Loeber
1987
Murder, She Wrote
as Greg Dalton
1987
The Twilight Zone
as (segment "The Card")
1986
No Mercy
as Allan Deveneux
1986
A Fight for Jenny
as Michael Rosen
1985
Real Genius
as Professor Hathaway
1985
Murder, She Wrote
as Larry Holleran
1985
The Twilight Zone
as Brian Wolfe (segment "Night of the Meek")
1984
Ghostbusters
as Walter Peck
1983
Malibu
as Stan Harvey
1982
Tomorrow's Child
as Jim Spence
1981
The House of Mirth
as Lawrence Selden
1978
Centennial
as Jim Lloyd
1977
Looking for Mr. Goodbar
as James
1976
Independence
as Benjamin Rush
1975
The Day of the Locust
as Tod Hackett
1975
The Hindenburg
as Boerth
1974
The Sugarland Express
as Clovis Poplin
1973
Class of '44
as Fraternity President
1972
The New Centurions
as Johnson
Midnight Men: A John Schlesinger and Michael Childers Story