David John Moore Cornwell (born 19 October 1931), who writes under the name John le Carré, is an author of espionage novels. During the 1950s and the 1960s, Cornwell worked for MI5 and MI6, and began writing novels under pseudonym. His third novel The Spy Who Came in from the Cold (1963) became an international best-seller and remains one of his best known works to date. Following the novel's success, he left MI6 to become a full-time author.
Le Carré has since written several novels that have established him as one of the finest writers of espionage fiction in 20th century literature. In 2008, The Times ranked le Carré 22nd on its list of "The 50 greatest British writers since 1945"