Simon David Kinberg (born August 2, 1973) is a screenwriter, film producer, and television producer. He is best known for his work on the X-Men film franchise, and has also written such films as Mr. & Mrs. Smith and Sherlock Holmes. He has served as a producer on others including Cinderella and The Martian, which was nominated for an Academy Award for Best Picture. His production company Genre Films had a first-look deal with 20th Century Fox. Kinberg made his directorial debut in the 2019 X-Men film Dark Phoenix from a script he also wrote.