
Richard Dysart
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.
Known for

Columbo
1971

Batman: The Animated Series
1992

L.A. Law
1986

Cannon
1971

Baretta
1975

The Defenders
1961

The Thing
1982

All in the Family
1971

Back to the Future Part III
1990

Maude
1972

NET Playhouse
1966

Spawn
1997

Wall Street
1987

Pale Rider
1985

Hard Rain
1998

The Falcon and the Snowman
1985

Mask
1985

Doctors' Hospital
1975

Gemini Man
1976

Meteor
1979

Being There
1979

Panther
1995

Warning Sign
1985

The Andros Targets
1977