However, when he reached the age of thirteen, the yeshiva's administration decided that his level of Talmudic study was too advanced for their school, so he was sent to learn under Rabbi Boruch Ber Leibowitz.
In Shanghai, Reb Nachum continued to learn with tremendous diligence, earning the respect and admiration of the Yeshiva's Mashgiach, Rabbi Yechezkel Levenstein, and acting Rosh Yeshiva, Rabbi Chaim Leib Shmuelevitz.
[3] After briefly immigrating to Toronto, Ontario, Canada, following World War II, Partzovitz moved to Israel and joined the newly established Mir Yeshiva of Jerusalem.
A Haggadah featuring words of Torah from the various Rosh Yeshivas of Mir also includes commentaries and lectures from Rabbi Nachum (Haggadah Shel Pesach, Mir (HE)).
Many parts of this article were adapted from "Sunset: Stories of Our Contemporary Torah Luminaries zt"l and Their Spiritual Heroism" (Chapter "Nochum Percowiz") by Hanoch Teller.