Richard Alden Griffin was an American artist and one of the leading designers of psychedelic posters in the 1960s. He was a key figure in the underground comix movement as a founding member of the Zap Comix collective. Griffin was closely identified with the Grateful Dead, designing some of their best-known posters and album covers including Aoxomoxoa. His work within the surfing subculture included both film posters and his comic strip, Murphy.