Rabbi Moshe Feinstein needs no introduction, as he literally carried Klal Yisrael on his shoulders.

Rabbi Moshe Feinstein (1895-1986) was the Rosh Yeshiva of Mesivta Tifereth Jerusalem. He he was one of the undisputed leaders of Orthodox Jewry and helped shape the Orthodox world after World War II. He was also considered the Posek HaDor.