Jack Wertheimerholds the Joseph and Martha Mendelson Chair in American Jewish History at the Jewish Theological Seminary of America, where he also directs the Joseph and Miriam Ratner Center for the Study of Conservative Judaism. He is the author of "Unwelcome Strangers: East European Jews in Imperial Germany" and is completing a book on the transformation of American Judaism in the second half of the twentieth century. He is also the editor of "The American Synagogue: A Sanctuary Transformed and The Uses of Tradition: Jewish Continuity in the Modern Era".