 While the Baal Shem Tov did not leave teachings in writing, many teachings, sayings and parables are recorded by his students, most notably in the "Toldot Yaakov Yosef" by Jacob Josef of Polonne, a disciple of the Baal Shem Tov.The teachings of the Baal Shem Tov's successor, Dov Ber the Maggid of Mezritch, were compiled in the work "Maggid D'varav L'yaakov" (compiled by Shlomo Lusk).Many of the Hasidic leaders of the third generation of Hasidism (students of Dov Ber) authored their own works, which are the basis for new Hasidic schools of thought.