Robert Chazan is S. H. and Helen R. Scheuer Professor of Jewish History in the Skirball Department of Hebrew and Judaic Studies at New York University. His most recent books are God, Humanity, and History: The Hebrew First Crusade Narratives (2000), Fashioning Jewish Identity in Medieval Western Christendom (Cambridge University Press, 2004), and The Jews of Medieval Western Christendom (Cambridge University Press, 2006).