This systematic history of modern Jewish philosophy is organized ideologically rather than chronologically, and its emphasis (like that of the philosophers whom it studies) is on the ethical content of Judaism. ""Modern,"" in this context, covers roughly the nineteenth and early twentieth centuries, and the book includes surveys of the thought of Mendelssohn, Luzzatto, Lazarus, Hermann Cohen, Formstecher, Hirsch and Krochmal, Steinheim and Rosenzweig, Rav Kook, and A. D. Gordon. Dr. Rotenstreich is careful to place his subjects within the framework of general philosophical thought, and the book offers, in that respect, interesting reflections on such influential figures as Kant, Marx, Jaspers, and Heidegger. This is the only book of its kind available in English. That, and the competence and lucidity of the author's presentation, will make it essential for students of Jewish thought.