While various religions posit a stark split between the "Spirit" and "Law," in Judaism, Kabbalah and Halakhah are frequently intertwined. Many of the great Jewish legal authorities, including R. Joseph Karo, Nachmanides, and the Vilna Gaon, were deeply steeped in kabbalistic teachings. Some refrained from professing these esoteric doctrines publicly, believing that this is much too risky an enterprise. Others, however, promoted kabbalistic practices and allowed Kabbalah to influence their halakhic rulings. In this session, we will study some dramatic examples of kabbalistic and halakhic symbiosis over the past centuries in important Jewish centers, such as Safed, Prague, Jerusalem and Brooklyn.