John Winfield Stephenson (born August 9, 1923–May 15, 2015) is an American actor, most active voice-over roles. He has also been credited as John Stevenson. Stephenson has never given any interviews and was rarely seen in public, although he did make an appearance at BotCon 2001. Since the death of Harvey Korman in 2008, he is one of the last surviving voice actors from the 1960s animated sitcom, The Flintstones, in which he played Mr. Slate.