 Kotler served as rosh yeshiva for nineteen years, seven months, and one day, exactly the same amount of time as did his father.This extraordinary coincidence was noted throughout the Torah world and seen as a sign that he had been a worthy son and successor who carried on his father's mission.He was succeeded as rosh yeshiva by his son, Rabbi Malkiel Kotler along with another three gedolei torah Rabbi Dovid Schustal, son-in-law, and Rabbi Yerucham Olshin and Rabbi Yisroel Neuman who are married to other grandchildren of Rabbi Aharon Kotler.