 He later learned in the Kaminetz yeshiva in Poland and became one of the leading students of Rabbi Baruch Ber Leibowitz.In 1940, when most yeshivas in Lithuania fled to Vilna—including the yeshiva in Kletzk (to where Rabbi Aharon Kotler had moved the Slutsk yeshiva)—Shneur also came to Vilna.There he became engaged to Rischel, the daughter of Malkiel Friedman.