Professor Julius Kelp is a fictional character from the 1963 film The Nutty Professor, portrayed by Jerry Lewis. He is a socially awkward and clumsy chemistry professor who creates a potion to transform himself into a more confident and charming version of himself, named Buddy Love. The character is known for his comedic antics and struggles with self-acceptance. The film explores themes of identity and the consequences of altering one's personality, making Professor Kelp a memorable figure in classic American cinema.