Rabbi Kaufmann Kohler originally published his Jewish Theology book in 1918, and now, over 100 years later, we have free access to it on the web, as a pdf, for Kindle and in EPUB format. What a blessing! I've linked to the pdf version in this post.
Orthodox rabbis and teachers had not previously compiled such a basic theological outline of Judaism, so it was unprecedented in the history of Jewish literature. It will interest and inform people of all religions about the basic way a Jew sees the God of the Universe.
Rabbi Kohler was associated with the Reform movement in his native Bavaria and then within the United States, starting in 1869 as an organizer and pulpit rabbi. In 1903 he was elected to become President of Hebrew Union College in Cincinnati, Ohio.