Shneur Zalman, Russian rabbi, author and founder of Chabad (died 1812)

Shneur Zalman of Liadi, 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.

Chabad, also known as Lubavitch, Habad and Chabad-Lubavitch, is a dynasty in Hasidic Judaism. Belonging to the Haredi (ultra-Orthodox) branch of Orthodox Judaism, it is one of the world's best-known Hasidic movements, as well as one of the largest Jewish religious organizations. Unlike most Haredi groups, which are self-segregating, Chabad mainly operates in the wider world and caters to nonobservant Jews.