He later served as rabbi and spiritual leader in a number of cities, including Libau in Latvia, Salant in Lithuania, and Kobryn in Belarus. In 1904, Rabbi Atlas was appointed rabbi to the community of Shavel.
In various cities such as Libau in Latvia, Salant in Lithuania, and Kobryn in Belarus, he served as a rabbi and spiritual leader. In 1904, Rabbi Atlas was assigned to be the rabbi of the Shavel community.