AT 40 with Ryan Seacrest
Ryan Seacrest is an American radio personality, television host, and producer. Seacrest is known for hosting the competition show American Idol, the syndicated countdown program American Top 40, and the KIIS-FM morning radio show On Air with Ryan Seacrest. He began co-hosting Live with Kelly and Ryan on a permanent basis May 1, 2017.
American Top 40 (commonly abbreviated to AT40) is an internationally syndicated, independent song countdown radio program created by Casey Kasem, Don Bustany, Tom Rounds and Ron Jacobs. The program is currently hosted by Ryan Seacrest.
Co-creator Casey Kasem hosted the original AT40 from its inauguration on July 4, 1970 until August 6, 1988. Shadoe Stevens took over the program on August 13, 1988 and hosted until January 28, 1995 when the original program came to an end. Three years later, Kasem teamed up with Premiere's predecessor AMFM Radio Networks to relaunch AT40. Kasem, who spent nine years hosting his own countdown for Westwood One, returned to hosting his creation on March 28, 1998. Seacrest took over AT40 on January 10, 2004 following Kasem's retirement from the series.