<p>Rav Nachum Abba Grossbard, mashgiach of Ponovezh (1993). He was one of the leading students of Rav Shimon Shkop of Grodno and Rav Boruch Ber Leibowitz of Kamenitz. He joined Yeshivas Mir in exile, and he formed a close bond with Rav Yechezkel Levenstein in Shanghai. Rav Grossbard is considered one of the leading rebuilders of the yeshiva world of America after the Holocaust. His son is Rav Shmuel Grossbard, rosh yeshiva of the Telstone Yeshiva Gedoloh in Eretz Yisrael.</p>