Jean Shepherd (1921-1999) was a writer, satirist, storyteller, and radio personality, perhaps best known for his many semi-autobiographical works dealing with his childhood. Much of this later became the basis for the film A Christmas Story, for which Shepherd co-wrote the screenplay and narrated. In 1971, Shepherd recorded all of the voices for the Sesame Street cartoon insert "Cowboy X." (First: Episode 0325)
Shepherd discussed the experience in detail on the September 07, 1971 broadcast of his radio program, which ran on New York station WOR from 1956 until 1977:
Shepherd also noted that the voice for Cowboy X was hard on his throat: "It's not easy to holler 'Yippee!' like that."