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Mo Willems is an animator and writer who has worked in both capacities on Sesame Street, and designed and directed the opening for "Elmo's World". As a writer, Willems contributed scripts from Season 24 through Season 33 (2002). He created and animated the many cartoon segments starring Suzie Kabloozie, as well as other spots, and wrote and directed the home video release The Alphabet Jungle Game.
Outside of Sesame Street, Willems created the Cartoon Network series Sheep in the Big City (which at various times featured Sesame Street cast members Joey Mazzarino, Stephanie D'Abruzzo, Ruth Buzzi and Jerry Nelson). He also wrote for Codename: Kids Next Door and created the "Off-Beats" interstitials for Nickelodeon. More recently, Willems has shifted to writing and illustrating children's books, including Don't Let the Pigeon Drive the Bus, Knuffle Bunny: A Cautionary Tale, and Leonardo the Terrible Monster.