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.