R' Yaakov Yitzchok Ruderman

 Ruderman was born to a Hasidic family of the Chabad denomination in Daŭhinava, in the Vilna Governorate of the Russian Empire (present-day Belarus), where his father, Rabbi Yehuda Leib Ruderman,[3] was the rabbi. He studied in Yeshivas Knesses Yisrael in Slabodke,[1] under the "Alter", Rabbi Nosson Tzvi Finkel, and the rosh yeshiva, Rabbi Moshe Mordechai Epstein, receiving semicha from the latter in 1926.

Yaakov Yitzchok Ruderman - Wikipedia