Greg began his career as part of the editorial staff at DC Comics’ Vertigo imprint. In 2015, he left Vertigo as it moved to Los Angeles and began working as a freelance editor and writer. 

Most recently, he edited the 3 FLOYDS: ALPHA KING series for Image Comics with Brian Azzarello, Nick Floyd, Simon Bisley, Ryan Brown, Jared K. Fletcher and Rob Syers. The collected edition is available now and a new series is in the works for 2019.

With Monica Gallagher and Tim Fish, Greg formed Poison Press, a comics collective that self-published three mini-comics since 2015. In September, Poison Press will debut a new 12-page historical gay romance written by Greg and illustrated by Tim. 

Greg also collaborated with Tim Fish, Michael DiMotta and Sal Cipriano on a short story for the WHERE WE LIVE anthology published by Image Comics.

A complete editorial bibliography is available upon request.