Justin Gray has worked for DC, Marvel, Image, and Wildstorm, but he is most well-known for his collaborations with fellow writer Jimmy Palmiotti. Together, Palmiotti and Gray wrote Hawkman, Power Girl, 21 Down, Uncle Sam and the Freedom Fighters, and The Resistance. While their team ups were successful, their work on Jonah Hex was particularly popular, lasting for six years and spanning over 70 issues. Gray has also written stories for Dc's iconic superheroes, including Batman, Superman, Supergirl, Justice League of America, and Harley Quinn. While Gray has written hundreds of DC issues, he has also worked on major Marvel characters, such as the Punisher, Fantastic Four, Luke Cage, and Iron Fist.