Leighton David Gage (May 13, 1942 – July 26, 2013) was an author of crime fiction best known for the Chief Inspector Mario Silva Investigations series of novels set in Brazil. He was inspired to write these novels after spending over 20 years living in Sao Paulo, Brazil, and being immersed in the Brazilian culture. The subjects in his novels are often real problems that exist in Brazil today, problems that are foreign to the American culture.