One of the largest branches of Hasidic Judaism, it originated in Russia in the 18th century. It was founded by Rabbi Schneur Zalman. In 1940, the Rebbe, or head of the movement, Rabbi Joseph Isaac Schneersohn, emigrated from Poland to America, where he was determined to make the Lubavitch into an American religious movement. Under his successor and son-in-law, Rabbi Menachem Mendel Schneerson, the Lubavitch used various forms of American media and institutions, such as schools and camps, to reach out to American Jews the group felt had not been exposed to “authentic” Judaism. Schneerson died in 1994, and a new leader has not been appointed. Lubavitchers still refer to him as “The Rebbe,” while they refer to his father-in-law as “The Previous Rebbe.” Some groups regard Schneerson as the Messiah and await his return, while others believe he could have been the Messiah if God had willed it. Still others believe he never died and is living in a way that ordinary people cannot perceive. The branch is also called Chabad-Lubavitch. Chabad comes from an acronym for the Hebrew words for wisdom, comprehension and knowledge. Lubavitch is the name of the town in Russia where the movement was based for more than a century. See Chabad.