His Life and Times
The Ramban

Though the Ramban earned his living as a doctor, he deliberately kept his practice small so that he would be free to spend much of his time learning Torah. Absorbing the teachings from three great rabbis who each embodied different streams of Jewish thought, the Ramban successfully synthesized them all to produce the Torah commentary that bridges the gap between Sephardim and Ashkenazim and their approaches to kabbalah.