Tzadok HaKohen of Lublin

Reb Tzadok HaKohen of Lublin, a famed master of Chasidic thought, wrote on many areas of Jewish and general studies, including halakhah, Chasidut, Kabbalah, ethics, astronomy, geometry, and algebra. Born into a rabbinic family affiliated with the mitnagdim (opponents of Chasidut), he was introduced to Chasidut by Rabbi Mordechai Leiner of Izhbitz and became his disciple. After the Izhbitzer's death, he became a follower of Rabbi Yehuda Leib Eiger, and eventually his successor as rabbi of Lublin. Reb Tzadok authored Peri Tzadik on the Torah, Tzidkat HaTzadik on human spirituality and divine providence, and many other works.