Kemal Amen "Casey" Kasem was an American disc jockey, music historian, radio personality, voice actor, and actor, best known for being the host of several music radio countdown programs, most notably American Top 40, from 1970 until his retirement in 2009, and for providing the voice of "Shaggy" Rogers in the Scooby-Doo franchise from 1969 to 1997, and again from 2002 until 2009.
Kasem co-founded the American Top 40 franchise in 1970, hosting it from its inception to 1988, and again from 1998 to 2004. Between January 1989 and early 1998, he was the host of Casey's Top 40, Casey's Hot 20, and Casey's Countdown. From 1998 to 2009, Kasem also hosted two adult contemporary spin-offs of American Top 40: American Top 20 and American Top 10.
In addition to his radio shows, Kasem provided the voice of many commercials, performed many voices for Sesame Street, provided the character voice of Peter Cottontail in the Rankin/Bass production of Here Comes Peter Cottontail, was "the voice of NBC", and helped out with the annual Jerry Lewis telethon.