Deborah Harkness is an American scholar and novelist, 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: A Novel, 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.

Harkness is also a professor of European history and the history of science at the University of Southern California (USC). She has written both historical books and fiction novels, including Conversations of John Dee with Angels: Cábala, alquimia y el fin de la naturaleza, and the New York Times best-seller, The All Souls Trilogy. She graduated from Mount Holyoke College (BA, 1986), Northwestern University (MA, 1990), and the University of California, Davis (Ph.D., 1994). Harkness has also studied in the United Kingdom at the University of Oxford.

In addition to her literary work, Deborah Harkness maintains a prestigious blog about wine, Good Wine Under $20, where she describes high-quality wines at an affordable price.