sentences:  His teachings derive from a wide range of Hasidic sources, including the Baal Shem Tov, Ramchal, Rebbe Nachman of Breslov, the Baal HaTanya, Chabad, and Izbica, as well as from the Vilna Gaon, Rabbi Tzadok Hakohen, and Rabbi Abraham Isaac Kook, among others.He also teaches works that were previously unavailable to the English-speaking public, such as the works of the "Bilvavi Mishkan Evneh".He has recorded over 3,500 lectures on Hasidic thought and philosophy.