"David Rudman - Baby Bear, Alarm Clock Bird, Fat Blue Anything Muppet, Caterpillar, Pestie, Collander Stenchman, Grouch Ice Cream Customer, Puppeteer of Mr. Johnson, Various Grouches"
January 1, 1970
https://en.wikiquote.org/wiki/The_Adventures_of_Elmo_in_Grouchland