Geoffrey Johns is an American comic book writer, screenwriter, and film and television producer. Johns's work on the DC Comics characters Green Lantern, Aquaman, Flash, and Superman has drawn critical acclaim. He co-created the DC character Courtney Whitmore based on his deceased sister. He also expanded the Green Lantern mythology, adding in new concepts and co-creating numerous characters. Among the DC characters and concepts he co-created are Larfleeze, the Sinestro Corps, the Indigo Tribe, the Red Lantern Corps, Atrocitus, the Black Lantern Corps, Jessica Cruz, Hunter Zolomon, Tar Pit, Simon Baz, Bleez, Miss Martian, and Kate Kane.

Green Lantern is the name of several superheroes appearing in American comic books published by DC Comics. They fight evil with the aid of rings that grant them a variety of extraordinary powers, all of which come from imagination, fearlessness, and the electromagnetic spectrum of emotional willpower. The characters are typically depicted as members of the Green Lantern Corps, an intergalactic law enforcement agency.