James "Jimmy" Crespo jr. (born July 5, 1954 in Brooklyn, New York) is an American guitarist. He was the lead guitarist for Aerosmith from 1979 until 1984. He co-wrote Rock in a Hard Place with Steven Tyler, and has performed or recorded with Rod Stewart, Billy Squier, Meat Loaf, Stevie Nicks, Robert Fleischman, Rough Cutt, Renegade, Flame and others.