Moss was one of the original creators and writers of Sesame Street. Moss created Cookie Monster and Oscar the Grouch, and wrote such songs as "Rubber Ducky" and "People in Your Neighborhood." He won 14 Emmys, four Grammys and an Academy Award nomination for his work on Sesame Street and with the Muppets. Moss was also the author of books for children, including Hieronymus White: A Bird Who Believed That He Always Was Right. He died in 1998 at the age of 56.