Robert Jonathan Vitti, Jr. (born March 20, 1956) is an American writer best known for his work on the television series The Simpsons. He has also written for the King of the Hill and The Critic series, and has served as a screenwriter or consultant for several animated and live-action movies, including Ice Age (2002) and Robots (2005). He is one of the eleven writers of The Simpsons Movie and also wrote the screenplays for the film adaptions Alvin and the Chipmunks and currently is writing Angry Birds for Rovio.