Menachem Kellner is Professor of Jewish Thought at the University of Haifa and a senior fellow at the Shalem Center, Jerusalem. He is the author of ``Dogma in Medieval Jewish Thought`` and ``Must a Jew Believe Anything?`` and translator of Isaac Abravanel’s Principles of Faith, all published by the Littman Library of Jewish Civilization. He is also the author of Maimonides on Human Perfection, Maimonides on Judaism and the Jewish People, and Maimonides on the ‘Decline of the Generations’ and the Nature of Rabbinic Authority. His translations of Gersonides’ Commentary on Song of Songs and Maimonides’ Book of Love appeared in the Yale Judaica Series. Professor Kellner’s critical editions of the original texts of Abravanel’s Principles of Faith and of Gersonides’ Commentary on Song of Songs were published in Hebrew.