Simon David Kinberg (born August 2, 1973) is an English-born American screenwriter and film producer. He is best known for his work in the X-Men film franchise, and wrote and/or produced several other box-office successes such as Mr. & Mrs. Smith, Sherlock Holmes, Cinderella, and The Martian. His production company is Genre Films (usually credited as Kinberg Genre), which has a first-look deal with 20th Century Fox.