Yisrael Mendel Kaplan
Israel or Yisrael Mendel Kaplan  (April 14, 1913 – April 4, 1985), known as "Reb Mendel" was an American Orthodox Jewish rabbi and author. He was best known as a teacher in the Hebrew Theological College of Chicago and the Talmudical Yeshiva of Philadelphia, where he mentored many future leaders of Orthodox Jewry.