Ivan G MarcusIvan G. Marcus is the Frederick P. Rose Professor of Jewish History at Yale University. He is the author of Piety and Society: The Jewish Pietists of Medieval Germany; Rituals of Childhood: Jewish Acculturation in Medieval Europe; The Jewish Life Cyce: Rites of Passage from Biblical to Modern Times; and "Sefer Hasidim" and the Ashkenazic Book in Medieval Europe. Read More Read Less