Kemal Amin "Casey" Kasem is a retired American musician, disc jockey, radio personality and actor, best known for being the host of the music radio programs American Top 40, American Top 20 and American Top 10 from 1970 until his retirement in 2009, and for providing the voice of Norville "Shaggy" Rogers in the Scooby-Doo franchise from 1969 to 1997, and again from 2002 until 2009.
Kasem, Don Bustany, Tom Rounds and Ron Jacobs founded the American Top 40 franchise in 1970, hosting it from 1970 to 1988 and 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. Also beginning in 1998, Kasem hosted two adult contemporary spin-offs of American Top 40, American Top 20, and American Top 10. Kasem retired from AT20 and AT10 on July 4, 2009 and both shows ended on that day.