From Wikipedia, the free encyclopedia. Robert Dennis Crumb (born August 30, 1943)—known as Robert Crumb and R. Crumb—is an American artist, illustrator, and musician recognized for the distinctive style of his drawings and his critical, satirical, subversive view of the American mainstream. Crumb was a founder of the underground comix movement and is regarded as its most prominent figure. Though one of the most celebrated of comic book artists, Crumb's entire career has unfolded outside the ma...