Rabbi Aharon (or Ahroyn, Aaron, Aron) Kotler (1891 - 1962) was a prominent leader of Orthodox Judaism in Lithuania, and later the United States of America, where he built one of the first yeshivas in the US. Wikipedia
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The definitive Wikipedia entry for Aharon Kotler. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Aharon_Kotler