Iain Banks wrote mainstream or literary fiction under his own name and science fiction under Iain M. Banks; Samuel Langhorne Clemens used the aliases Mark Twain and Sieur Louis de Conte for different works. Similarly, an author who writes both fiction and non-fiction (such as the mathematician and fantasy writer Charles Dodgson, who wrote as Lewis Carroll) may use a pseudonym for fiction writing. Science fiction author Harry Turtledove has used the name H. N. Turtletaub for a number of historical novels he has written because he and his publisher felt that the presumed lower sales of those novels might hurt book store orders for the novels he writes under his own name. Occasionally, a pen name is employed to avoid overexposure. Prolific authors for pulp magazines often had two and sometimes three short stories appearing in one issue of a magazine; the editor would create several fictitious author names to hide this from readers. Robert A. Heinlein wrote stories under pseudonyms of Anson MacDonald (a combination of his middle name and his then wife's maiden name) and Caleb Strong so that more of his works could be published in a single magazine. Stephen King published four novels under the name Richard Bachman because publishers did not feel the public would buy more than one novel per year from a single author. Eventually, after critics found a large number of style similarities, publishers revealed Bachman's true identity. Sometimes a pen name is used because an author believes that their name does not suit the genre they are writing in. Western novelist Pearl Gray dropped his first name and changed the spelling of his last name to become Zane Grey because he believed that his real name did not suit the Western genre. Romance novelist Angela Knight writes under that name instead of her actual name (Julie Woodcock) because of the double entendre of her surname in the context of that genre. Romain Gary, who was a well-known French writer, decided in 1973 to write novels in a different style under the name Émile Ajar and even asked his cousin's son to impersonate Ajar; thus he received the most prestigious French literary prize twice, which is forbidden by the prize rules. He revealed the affair in a book he sent his editor just before committing suicide in 1980. Some pen names have been used for long periods, even decades, without the