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.

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Richard Dysart was a respected American character actor and a founding member of the American Conservatory Theatre, primarily known for his role as Leland McKenzie in the television series L.A. Law.
He is widely recognized for his portrayal of Leland McKenzie in L.A. Law, as well as his supporting performances in films such as The Thing, Pale Rider, and Wall Street.
He was a prolific character actor whose career spanned over four decades, frequently portraying authoritative, distinguished, and professional figures in television and cinema.