Sholom Dovber Schneersohn was the fifth rebbe of the Chabad-Lubavitch chasidic movement. He is known as "the Rebbe Rashab". His teachings that encouraged outreach were further developed by later.

A Rebbe or Admor is the spiritual leader in the Hasidic movement, and the personalities of its dynasties. The titles of Rebbe and Admor, which used to be a general honor title even before the beginning of the movement, became, over time, almost exclusively identified with its Tzadikim.