Yitzchok (Isaac) Hutner (1906 - 1980) was an Orthodox rabbi born in Warsaw, Poland, to a family with both Ger Hasidim and non-Hasidic Lithuanian Jews in their origins. He received private instruction in Torah and Talmud. As a young teenager, he was enrolled in the famous "mussar" Slabodka yeshiva in Lithuania, headed by the famous Rabbi Nosson Tzvi Finkel. There, he was known as the "Warsaw Illui" ("prodigy"). Wikipedia
Rav Hutner was a founder and Rosh Yeshiva of Pachad Yitzchok in Har Nof Jerusalem, Mesivta Rabbi Chaim Berlin and Kollel Gur Aryeh which have produced thousands of disciples. www.ou.org/about/judaism/rabbis/hutner.htm
The definitive Wikipedia entry for Yitzchok Hutner. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Yitzchok_Hutner