Yaakov Kronenberg is eminently suitable to write this ground breaking work on Jewish astrology. Yaakov is an accomplished scholar in Rabbinical and kabbalistic texts and studied with many of the kabbalistic masters of the previous generation. Besides that he studied privately for a number of years with an old Jewish Hungarian mystic in New york city ancient and medieval astrology and is an accomplished astrologer in his own right giving him the background and understanding to explore the old Jewish texts.