The creator of character John Constantine, born in 1955, also worked on what comic? 
Hellblazer:  Its central character is the streetwise magician John Constantine, who was created by Alan Moore and Stephen R. Bissette, and first appeared as a supporting character in "The Saga of the Swamp Thing" #37 (June 1985), during that creative team's run on that title. Stephen R. Bissette:  He is known for working with writer Alan Moore and inker John Totleben on the DC comic book "Swamp Thing" in the 1980s.
Swamp Thing