After moving from Romania as a child, he studied at Yeshivat Chaim Berlin in New York under Rabbi Yitzchok Hutner, as well as learning under Rav Soloveitchik.
Together with the dean of the Yeshiva Torah Vodaas, Rabbi Shraga Feivel Mendlowitz, a charter to set up a combined yeshiva and college was obtained from the New York State Board of Regents.
Yitzchok Adlerstein | Yitzchok Hutner | Yitzchok Zilberstein | Yitzchok Dovid Groner | Yaakov Yitzchok Ruderman | Levi Yitzchok of Berditchev |
Aba also established close links with many of the leading rabbinic luminaries of the time, whom he consulted for advice, and whom he offered his services - men such as Rabbi Leib Gurwicz, Rabbi Avrohom Babad, Rabbi Yitzchok Hutner, Rabbi Moshe Feinstein, Rabbi Eliezer Menachem Schach, and Rabbi Yosef Kahaneman, the Ponovezh Rav.