Donald Eugene "Don" Pendleton was an American author of fiction and nonfiction books, best known for his creation of American hero The Executioner: Mack Bolan. Other works include the Joe Copp, Private Eye series of six novels, the Ashton Ford, Psychic Detective series of six novels, and nonfiction books. He collaborated on several books with his wife, Linda Pendleton, including their popular nonfiction book, To Dance With Angels. His earlier writings in the 1960s include mysteries, Sci-Fi and futuristic books. Pendleton wrote several early books under the pseudonyms Dan Britain and Stephan Gregory.