Richard Allen Dysart (March 30, 1929 – April 5, 2015) was an American actor. He is best known for his role as senior partner Leland McKenzie in the television series L.A. Law (1986–1994), for which he won a 1992 Primetime Emmy Award as Outstanding Supporting Actor in a Drama Series after four consecutive nominations. In film, he held supporting roles in The Hospital (1971), Being There (1979), The Thing (1982), Mask (1985), Pale Rider (1985) and Wall Street (1987). Description above from the Wikipedia article Richard Dysart, licensed under CC-BY-SA, full list of contributors on Wikipedia.
2009Everything Is Terrible! The Movie as Self (archive footage)
2004Proteus: A Nineteenth Century Vision as The Ancient Mariner (voice)
2002L.A. Law: The Movie as Leland McKenzie
1998Hard Rain as Henry Sears
1997Spawn (18 Episodes) as Nicholas Cogliostro (voice)
1996E! True Hollywood Story (1 Episode) as Unknown
1996Corwin as Self
1995A Child Is Missing as Riley Hallihan
1995Truman as Henry L. Stimson
1995Panther as J. Edgar Hoover
1993Marilyn & Bobby: Her Final Affair as J. Edgar Hoover
1992Batman: The Animated Series (2 Episodes) as Dr. Bartholomew (voice)
1990Back to the Future Part III as Barbwire Salesman
1989Day One as President Harry S. Truman
1988Mickey's 60th Birthday as Leland McKenzie
1988Moving Target as Arthur Cambridge
1988Your Alcohol I.Q. as Self
1987Wall Street as Cromwell
1987Jay Leno's Family Comedy Hour as Self
1987Six Against the Rock as Warden James Johnston
1986The Last Days of Patton as Gen. Dwight D. Eisenhower
1986L.A. Law: Pilot as Leland McKenzie
1986L.A. Law (171 Episodes) as Leland McKenzie
1986Blood & Orchids as Harvey Koster
1985Warning Sign as Dr. Nielsen
1985Pale Rider as Coy LaHood
1985Mask as Abe
1985The Falcon and the Snowman as Dr. Lee
1985Malice in Wonderland as Louis B. Mayer
1982Missing Children: A Mother's Story as Hunter Burgess
1982The Thing as Dr. Copper
1981Bitter Harvest as Dr. Morton Freeman
1981People vs. Jean Harris as Judge Russell R. Leggett
1980The Ordeal of Dr. Mudd as Edwin Stanton
1980Bogie as Jack Warner
1979Being There as Dr. Robert Allenby
1979Meteor as Secretary of Defense
1979Churchill and the Generals as Gen. Dwight D. Eisenhower
1979Prophecy as Trevor Isley
1978First, You Cry as Dr. Brennerman
1978An Enemy of the People as Aslaksen
1977It Happened One Christmas as Peter Bailey
1977The Court-Martial of George Armstrong Custer as President Ulysses S. Grant
1977The Andros Targets (1 Episode) as Dr. Kipness
1976Gemini Man (1 Episode) as Leonard Driscoll
1976Riding with Death as Leonard Driscoll
1975The Hindenburg as Lehman
1975Doc (1 Episode) as Unknown
1975Doctors' Hospital (1 Episode) as Unknown
1975The Day of the Locust as Claude Estee
1975Baretta (1 Episode) as Unknown
1974The Crazy World of Julius Vrooder as Father
1974Lincoln (6 Episodes) as Judge David Davis
1974The Terminal Man as Dr. John Ellis
1974The Autobiography of Miss Jane Pittman as Master Bryant
1972Maude (1 Episode) as Unknown
1971The Hospital as Dr. Welbeck
1971Columbo (1 Episode) as Max Duval
1971Cannon (1 Episode) as Unknown
1971The Sporting Club as Spengler
1971All in the Family (1 Episode) as Russ DeKuyper
1969The Lost Man as Barnes
1969Shadow Game as Jerry Arnst
1968Petulia as Motel Receptionist
1966CBS Playhouse (1 Episode) as Unknown
1963Love with the Proper Stranger as Accountant (uncredited)
1961The Defenders (1 Episode) as Mr. Westfall
1951Hallmark Hall of Fame (1 Episode) as Unknown