Yitzchak Isaac Sher

Rabbi Yitzchak Isaac Sher (c. 1875-1952) was a rosh yeshiva of the Slabodka yeshiva, Yeshiva Knesses Yisrael, associated with the mussar movement. Born in Halusk (Hlusk), in present-day Belarus, he studied at the Volozhin yeshiva under Refael Shapiro, spent time at Kelm and briefly at Mir, and settled at Slabodka, where he married a daughter of Rabbi Nosson Tzvi Finkel, the Alter of Slabodka. He taught at the yeshiva from 1911, becoming head of its Beis Yisrael kollel in 1921 and rosh yeshiva later in that decade. During the First World War the yeshiva relocated for a time to Minsk and Kremenchug. Away in Switzerland when the Second World War began, he later reached the Land of Israel and, in 1947, helped reestablish the yeshiva in Bnei Brak, where he died in 1952. He authored the works Beis Yisrael and Avraham Avinu.