Chaim Leib Shmuelevitz  Rav Chaim Leib Halevi Shmuelevitz, ( ;1902–1979) — also spelled Shmulevitz, in — was a member of the faculty of the Mirrer Yeshiva for more than 40 years, in Poland, Shanghai and Jerusalem, serving as Rosh yeshiva during its sojourn in Shanghai from 1941 to 1947, and again in the Mirrer Yeshiva in Jerusalem from 1965 to 1979. He taught, guided, and inspired thousands of disciples throughout his lifetime, by word and deed, with legendary diligence and intensity in Torah study. Rav Shmuelevitz was born on the second day of Rosh Hashana 5663 (3 October 1902) in Kovno, Lithuania, to Rav Refoel Alter Shmuelevitz and Ettel (née Horowitz), a daughter of Rav Yosef Yozel Horwitz, known as the Alter of Novhardok. The sandek at his bris milah was Rav Yitzchok Blazer ("Reb Itzele Peterburger"), a Torah and mussar luminary of the time, who was one of Rav Yisrael Salanter's greatest disciples. In Rav Chaim Leib's youth, his family moved to Stutchin. Until the age of 16, he was educated by his father, who was one of the leading yeshiva lecturers in Lithuania. In 1919 Rav Refoel Alter, who was then the rosh yeshiva of "Shaarei Torah" in Grodno, died suddenly. Within a very short time, his mother died too, orphaning Rav Chaim Leib, his younger brother Shlomo, and two sisters. Rav Refoel Alter's position at the yeshiva was taken up by Rav Shimon Shkop. Rav Chaim Leib developed a close bond with Rav Shkop. At the age of 18, Rav Chaim Leib's mentor invited him to deliver the third-level shiur in the preparatory academy at the yeshiva. Rav Shmuelevitz held this position for a few years before transferring to the yeshiva in Mir. Many of his students of those years later became great Torah leaders, and his own four years in Grodno with Rav Shkop had a profound influence on his approach to Talmudic analysis. At the age of 22, Rav Shmuelevitz headed a group of students who transferred from Grodno to Mir.