A brilliant intellectual biography of a spiritual hero, a leading eighteenth-century Hasidic master and leader, a mystical revolutionary thinker who took upon himself to act in a world seemingly not guided by divine intervention, hidden or revealed. Skillfully and felicitously written by one of the world’s leading scholars of Hasidism, it presents new dimensions of the thoughtful, profound, and original author of Kedushat Levi (1798), and contextualizes the mystical-Hasidic phenomenon in the spiritual and historical circumstances in which it evolved.