Shneur Zalman of Liadi

Shneur Zalman of Liadi, (Hebrew: שניאור זלמן מליאדי; September 4, 1745 – December 15, 1812 O.S. / 18 Elul 5505 – 24 Tevet 5573) commonly known as the Alter Rebbe or Baal Hatanya, was a rabbi and the founder and first Rebbe of Chabad, a branch of Hasidic Judaism. He wrote many works and is best known for Shulchan Aruch HaRav, Tanya, and his Siddur Torah Or, compiled according to the Nusach Ari.