Shaye J. D. Cohen is the Littauer Professor of Hebrew Literature and Philosophy in the Department of Near Eastern Languages and Civilizations of Harvard University. He received his Ph.D. in Ancient History, with distinction, from Columbia University in 1975. He is also an ordained rabbi, and for many years was the Dean of the Graduate School and Shenkman Professor of Jewish History at the Jewish Theological Seminary in New York City. Before arriving at Harvard in July 2001, he was for ten years the Samuel Ungerleider Professor of Judaic Studies and Professor of Religious Studies at Brown University. The focus of Cohen's research is the boundary between Jews and gentiles and between Judaism and its surrounding culture. He is also a published authority on Jewish reactions to Hellenism and to Christianity.