From Wikipedia
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, The Flash, and Superman has drawn critical acclaim. His critically acclaimed work includes Sinestro Corps War, Blackest Night, Infinite Crisis, Throne of Atlantis, Flashpoint, Doomsday Clock, Superman: Last Son, and Superman: Brainiac. 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.
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