Gregg Hurwitz is an American novelist, screenwriter, and comic book writer born in San Francisco in 1973. Most of his novels are in the thriller fiction genre, and he has built a career across multiple entertainment mediums. His work in screenwriting includes a film adaptation of his novel Orphan X, a television adaptation of Joby Warrick's Black Flags: The Rise of ISIS, and a screenplay for the 2017 film The Book of Henry. In addition to his original screenwriting, Hurwitz has written comic books for major publishers including DC Comics and Marvel Comics.