Ed Hannigan has been a writer, artist and editor of comic books for both Marvel Comics and DC Comics. His most notable writing credits include work on The Defenders during the late 1970s and early 1980s. He pencilled the covers on Batman in a lengthy run that spanned the majority of 1983-1985 (with Don Newton providing the interior art). It is also worth noting that he both wrote and illustrated the three issue prestige format series, Skull & Bones for DC Comics in 1992.
Ed Hannigan was also the artist on DC Comics's first ongoing Green Arrow comic book beginning in 1987. This legendary, groundbreaking series written by Mike Grell (Jon Sable, Freelance) continued in the serious, realistic direction Grell began in his limited series, The Longbow Hunters, wherein Green Arrow sheds his trick-arrows (such as the classic boxing glove arrow), dons a Robin Hood like costume, and lives in a flower shop in Seattle with Dinah Lance, the Black Canary.