Yitzchok Hutner

Rabbi Yitzḥok (Isaac) Hutner (Hebrew: יצחק הוטנר‎; 1906–1980) was an American Orthodox rabbi and rosh yeshiva. From 1951 to 1982, he published what is considered to be his magnum opus, and which he named Pachad Yitzchok, ("Fear [of] Isaac", meaning the God whom Isaac [had] feared). He called his outlook Hilchot Deot Vechovot Halevavot, ("Laws [of] 'Ideas' and 'Duties [of the] Heart'") and wrote in a poetic modern-style Hebrew reminiscent of his original mentor Rav Kook's style, even though almost all of Hutner's original lectures were delivered in Yiddish. The core of his synthesis of different schools of Jewish thought was rooted in his deep studies of the teachings of Rabbi Judah Loew ben Bezalel (1525–1609) a scholar and mystic known as the Maharal of Prague. Various pillars of Hutner's thought system were likely the works of the Vilna Gaon, Rabbi Elijah, (1720–1797) and of Rabbi Moshe Chaim Luzzatto (1707–1746). He would only allude in the most general ways to other great mystics, in Hebrew mekubalim, such as the Baal Shem Tov (founder of Hasidism), the great mystic known as the Ari who lived in the late Middle Ages, the founder of Chabad Hasidism, the Baal HaTanya Shneur Zalman of Liadi, Rabbi Mordechai Yosef Leiner of Izbitz and many other great Hasidic masters as well as to the great works of Kabbalah such as the Zohar. (via wikipedia)

https://en.wikipedia.org/wiki/Yitzchok_Hutner