Rick GriffinRick Griffin.

Richard Alden Griffin (June 18, 1944, August 18, 1991) 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.