Lyon Sprague de Camp (November 27, 1907 – November 6, 2000) was an American author of science fiction and fantasy books, non-fiction and biography. In a writing career spanning 60 years, he wrote over 100 books, including novels and notable works of non-fiction, including biographies of other important fantasy authors. He "was widely regarded as an imaginative and innovative writer and was an important figure in the heyday of science fiction, from the late 1930's through the late 1940's."