Claim: Richard Alden "Rick" Griffin (died on June 18, 1944) was an American artist and one of the leading designers of psychedelic posters in the 1960s and a contributor to the underground comix movement.
Evidence: Richard Alden "Rick" Griffin (June 18, 1944 – August 18, 1991) was an American artist and one of the leading designers of psychedelic posters in the 1960s. As a contributor to the underground comix movement, his work appeared regularly in Zap Comix.