Peter was a naval officer and published author in Scandinavian archaeology before he turned to writing for video games and movies. He scripted the console video games Watchmen: The End is Nigh (Parts 1 and 2) and The Legend of the Guardians: The Owls of Ga'Hoole. He also penned the books Watchmen: The Art of the Film, Watchmen: The Official Film Companion, Chappie: The Art of the Movie, and Batman v Superman: Dawn of Justice: The Art of the Film. A film he co-wrote, Devil's Gate, premiered at the 2017 Tribeca Film Festival. He is currently working on a Norse mythology animated series for Netflix. He lives in southern California with his wife and two daughters.