Alexander of Hales (c. 1186–1245)

English theologian. As professor of theology in Paris he taught St Bonaventure and Roger Bacon. His principal work is Summa theologica 1373, which is thought to be largely the work of his followers, derived from Alexander's unfinished Summa 1245.

He was born at Halesowen, Worcestershire, studied at the University of Paris, and in 1236 joined the Franciscan order. He introduced Peter Lombard's Sentences into the theological curriculum of the university.