Professor Grampy is an animated cartoon character appearing in the Betty Boop series of shorts produced by Max Fleischer and released by Paramount Pictures.
Grampy is an ever-cheerful and energetic senior citizen with a bald head and a white beard. His primary activities include singing, dancing and building Rube Goldberg-esque devices out of ordinary household items. When presented with an unexpected new problem, he will put on his thinking cap (a mortarboard with a light bulb on top). In short order the lightbulb lights up and Grampy builds a new gadget to solve the problem.
It is not clear whether Grampy is actually related to Betty Boop, because everyone calls him "Grampy" and he seems to be equally affectionate to almost everyone he meets.