Film

Lilith … Howie (9-27-1964) (Premiere: United Kingdom, 9-20-1964)
Petulia … Fred Six (salesman) (6-10-1968)
M*A*S*H … Father John Patrick “Dago Red” Mulcahy (1-25-1970)
Brewster McCloud … The Lecturer (12-5-1970)
McCabe and Mrs. Miller … Pat Sheehan (6-24-1971)
Bleep! … Arthur the Egg (8-18-1971) (rereleased in 1983 as Teenage Tease)
Pete ‘n’ Tillie … Jimmy Twitchell (12-17-1972)
Images … Hugh (12-18-1972) (Premiere: Cannes Film Festival, May 1972)
The Hindenburg … Major Napier (12-25-1975)
The Big Bus … Father Kudos (6-23-1976)
King Kong … Roy Bagley (12-17-1976) (Premiere: France, 9-8-1976)
The Eyes of Laura Mars … Donald Phelps (8-2-1978)
Where the Buffalo Roam … Harris (4-25-1980)
3:15 The Moment of Truth … Principal Horner (1-31-1986)
Walker … Major Siegfried Henningson (12-4-1987)
Police Academy 5: Assignment Miami Beach … Tony Stark (3-`8-1988)
My Best Friend is a Vampire … Modoc (5-6-1988) (Premiere: West Germany, 10-1-1987)
The Feud … Reverton (5-4-1989) (Premiere: Canada, 1989)
Star Trek VI: The Undiscovered Country … Colonel West (2-6-1991)
The Player … Actor (Himself) (4-10-1992)
The Ballad of Little Joe … Straight Hollander (8-20-1993)
Batman Forever … Dr. Burton (6-16-1995)
Los Locos: Posse Rides Again … Presidente (12-20-1997)
Inspector Gadget … Dr. Artemus Bradford (7-23-1999)
The Patriot … Reverend Oliver (6-27-2000)
We All Fall Down … Tim (10-12-2000)
Burning Down the House: Medicine Show … Pierre (2-7-2001)
The Princess Diaries … Prince of Genovia (voice) (7-29-2001)
Snide and Prejudice … Dr. Sam Cohen (11-9-2002) (Premiere: Cannes Film Festival, 5-11-1997)
Eulogy … Parson Banke (10-15-2004)
Evermore … Granpa Charles (11-18-2013)
This is Happening … Cal Plotz (4-17-2015)
Certain Women … Albert (Premiere: Sundance, 1-24-2016)
Blood Stripe … Art (June 2, 2016)
Windows on the World … (Premiere: Sedona International Film Festival, February 2019)
Raising Buchanan … James Buchanan (Premiere: Phoenix Film Festival, April 12, 2019)
First Cow … Hermit (Premiere: Telluride Film Festival, August 30, 2019)

Web Series (webisodes)

Anthony E. Zuiker Presents (Blackbox TV) “Execution Style” … Rudy (9-15-2012)

Short Film

Le Perroquet (a film by Finnigan Heid) – USA Film Festival, Dallas, TX … Man (4-29-2017)