Professor Frink is the nutty professor of Springfield. His high I.Q. makes it difficult to relate to other people, except for Lisa, who is in MENSA with him.

Professor John Frink is voiced by Hank Azaria, mimicing the goofy voice of Jerry Lewis. Frink has been featured in many episodes, such as "Homer Defined," "Rosebud," "Bart's Comet," "22 Short Films About Springfield" and "Last Tap Dance in Springfield." Usually he is called upon for his wacky inventions or outlandish theories.