Robert is a New York Times bestselling author whose characters and stories have been adapted to film, television, animation, and video games. Some of his works include the monthly comic book series Superman ’78, Hawkman, Green Lantern, and Justice League for DC Comics, X-O Manowar and Wrath of the Eternal Warrior for Valiant Entertainment, and the graphic novel Six Days, inspired by the story of his uncle’s participation in D-Day.

He has also adapted Rick Riordan’s global bestselling Percy Jackson and the Olympians and The Heroes of Olympus series. His most recent projects include Ordained, Planet Death, and MrBallen Presents: Strange, Dark & Mysterious.