
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.

as The Father

as Mayor Walter Peck

as Terry Drummond

as Self

as Father Westhoff

as Dolan

as Earle Swinter

as Daniel Morgan

as Stefan

as Jo Dexton

as Howard

as Adult David Moran

as King

as John

as Agent Block

as Dr. Ira Gold

as Sen. Ray Colby

as Duncan Mack

as Winchester Rep

as Ralph Stanton

as Arthur Kranston

as Party Guest (uncredited)

as Nathan Randall

as Darryl Zanuck

as James Denit

as Dohlen

as President Fields

as Thomas E. Dewey

as Philip Thorne

as Dr. Noah Faulkner

as Neil Roemer

as Self

as Dr. Reginald Holloway

as Allan Pinkerton

as Terence

as Bob Gminski

as Sheriff Blackwell

as Eric Walker

as Overton

as Arthur

as Richard Thornberg

as Cort van Owen

as Doggett

as Richard Thornburg

as Martin 'Alpha' Loeber

as Allan Deveneux

as Michael Rosen

as Professor Hathaway

as Walter Peck

as Stan Harvey

as Jim Spence

as Lawrence Selden

as James

as Benjamin Rush

as Boerth

as Tod Hackett

as Clovis Poplin

as Fraternity President

as Johnson