Deborah Harkness (born 1965) is an American scholar, novelist and wine enthusiast, best known as a historian and as the author of the All Souls Trilogy, which consists of The New York Times best-selling novel A Discovery of Witches and its sequels Shadow of Night and The Book of Life. Her latest book is Time's Convert, both an origin story of the trilogy’s Marcus Whitmore character, set in the American War of Independence and the French Revolution, and a sequel to the All Souls Trilogy.