He's just one of the many creators listed in the credits during their special thanks, before the post-credits scene… and the post-credits note.
The ain character comic book creator credits from Guardians Of The Galaxy Vol 3 run as follows:
Drax & Gamora created by JIM STARLIN
Groot created by STAN LEE, LARRY LIEBER and JACK KIRBY
Mantis created[...]
Timothy Green II Archives
We told you there were plenty of creative changes coming at DC, but even we didn't expect this much.
DC Comics is continuing its recruitment policy from the likes of Image Comics, by signing up the writer of Wild Children and Change, Ales Kot, to write Suicide Squad, joined by new artist Timothy Green II.
No[...]
Eliot Cole writes for Bleeding Cool Avengers Academy thirty three is the best tie in to AvX that I've read. It's also in the top tier of AA issues, too.