John Stephenson

John Stephenson was an American screen and voice actor, closely associated with characters in Hanna-Barbera productions, most famously Mr. Slate, Fred Flintstone's bad tempered boss in The Flintstones. He reprised his role for the many revivals and specials that were done in the decades following. He was also the narrator of the Dragnet TV series and did several roles in The Transformers.