Jacob Katz (1904-1998) was one of the greatest Jewish historians of the twentieth century. A pioneer of new foci and methods, Katz brought extraordinary insights to many aspects of Jewish life and its surrounding contexts. With a keen eye for both "forests" and "trees, " Katz transformed our understanding of many areas of Jewish history, among them: Jewish-Christian relations in the Middle Ages, the social-historical significance of Jewish law, the rise of Orthodoxy in Germany and Hungary, and the emergence of modern antisemitism. In this volume, ten leading scholars critically discuss Katz's work with an appreciation for Katz's importance in reshaping the way Jewish history is studied.