Yeruchom Levovitz
Rabbi Yeruchem Halevi Levovitz (or Leibovitz) (ca. 1873-1936), also known by his hundreds of students simply as The Mashgiach, was a famous mashgiach ruchani and baal mussar (ethicist) at the Mir yeshiva in Poland.
He was born in 1873 (5633 in the Jewish calendar) in Lyuban, Minsk Voblast, Belarus (near Slutsk) to Avraham and Chasha Levovitz. He received his education in the yeshivas of Slobodka and Kelm.
He was a disciple of Rabbi Nosson Tzvi Finkel, Simcha Zissel Ziv of Kelm as well as Rabbi Yisrael Meir Kagan (Chofetz Chaim) of Radin.
Read more about Yeruchom Levovitz: Mir Yeshiva, Disciples, Rebuilding in America