Bud Yorkin, who directed and produced some of the most influential television shows of the 1970s, has died of natural causes, The Los Angeles Times reports. He was 89.

Yorkin helped change the television landscape when he developed the groundbreaking sitcom All in the Family with his producing partner Norman Lear. The series helped establish TV as a place for social commentary, tackling issues including racism and sexism.

Yorkin went on to produce a string of other hits such as The Jeffersons, Sanford and Son and Maude. He also directed many features films, including Arthur 2: On the Rocks, Start the Revolution Without Me and Come Blow Your Horn.

He is survived by his wife, Cynthia Sikes Yorkin, sons David and Michael, daughters Nicole and Jessica, and four grandchildren.

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