Areas of Research/Interest: Medieval Jewish history

Affiliated with other departments or programs: Director, Wagner-Skirball Dual Degree Program; Co-Director, Doctoral Program in Education and Jewish Studies.

External Affiliations: : Fellow, American Academy for Jewish Research; Fellow, Medieval Academy of America; Chairman-Graduate Fellowship Committee, Wexner Foundation

Select Publications:

Medieval Jewry in Northern France (Baltimore: Johns Hopkins University Press, 1974)

Church, State, and Jew in the Middle Ages (New York: Behrman House, 1980)

European Jewry and the First Crusade (Berkeley and Los Angeles: University of California Press, 1987)

Daggers of Faith: Thirteenth-Century Christian Missionizing and Jewish Response (Berkeley and Los Angeles: University of California Press, 1989)

Barcelona and Beyond: The Disputation of 1263 and Its Aftermath (Berkeley and Los Angeles: University of California Press, 1992)

In the Year 1096: The Jews and the First Crusade (Philadelphia: Jewish Publication Society of America, 1996)

Medieval Stereotypes and Modern Antisemitism (Berkeley and Los Angeles: University of California Press, 1997)

God, Humanity, and History: The Hebrew First-Crusade Narratives (Berkeley and Los Angeles: University of California Press, 2000)

Fashioning Jewish Identity in Medieval Western Christendom (Cambridge: Cambridge University Press, 2004)

The Jews of Medieval Western Christendom (Cambridge: Cambridge University Press, 2006; Cambridge Medieval Textbooks)