Lerner (born 1940 in New York) is an American medieval historian and professor of history emeritus at Northwestern University.Lerner gained his B.A.
at the University of Chicago and his Ph.D.
at Princeton in 1964, where he studied with Joseph R.
Strayer.
Lerner has specialised in medieval heresy and millennial eschatology, as well as writing on a variety of topics in medieval religious and intellectual history.
His major monographs are The Heresy of the Free Spirit in the Later Middle Ages (1972), The Powers of Prophecy (1983), and The Feast of Saint Abraham (2001).
Prominent among his articles are the widely cited “Refreshment of the Saints” (1976) and “Ecstatic Dissent” (1992).
In addition, he was the co-author of a best-selling Western Civilization textbook, a work translated into Spanish, Portuguese, Chinese, and Korean.
Lerner is a fellow of the Medieval Academy of America and the American Academy in Rome.
He is an active member on the editorial boards of a variety of historical journals.
Lerner recently published a biography of the medieval historian Ernst Kantorowicz and is currently preparing an edition of a treatise written during the Great Schism of the West.
He lives in Evanston, Illinois and is married with two daughters.