The New York Times said his death was confirmed by his friend Raoul Felder.
Mason was one of the last of the Borscht Belt comedians, and he married that sensibility to strong views on racial and ethnic politics.
He also recurred on “The Simpsons” as the voice of Rabbi Hyman Krustofsky, the father of Krusty the Clown, winning his second Emmy for his efforts in 1992 and most recently voicing the character in a 2014 episode. He also appeared as himself in a 2007 episode of “30 Rock.”
In the 2004 TV special “Comedy Central Presents: 100 Greatest Stand-Ups of All Time,” he was ranked No. 63.
The comic received a 1987 special Tony Award for his