Robert Dennis Crumb is an American artist who often signs his work R. Crumb. His work displays a nostalgia for American folk culture of the late 19th and early 20th centuries, and satire of contemporary American culture.
Crumb contributed to many of the seminal works of the underground comix movement in the 1960s, including being a founder of the first successful underground comix publication, Zap Comix, contributing to all 16 issues. He was additionally contributing to the East Village Other and many other publications, including a variety of one-off and anthology comics. During this time, inspired by psychedelics and cartoons from the 1920s and 1930s, he introduced a wide variety of characters that became extremely popular, including countercultural icons Fritz the Cat and Mr. Natural, and the images from his Keep On Truckin' strip. Sexual themes abounded in all these projects, often shading into scatological and pornographic comics.