Premise: Elazar Menachem Man Shach (Hebrew: אלעזר מנחם מן שך‎ ) Elazar Shach (January 1, 1899 O.S. – November 2, 2001) was a leading Lithuanian-Jewish Haredi rabbi in Bnei Brak, Israel. He also served as one of three co-deans of the Ponevezh Yeshiva in Bnei Brak, along with Rabbis Shmuel Rozovsky and Dovid Povarsky.
Hypothesis: Elazar Menachem Man Shach served as co-dean of the Ponevezh Yeshiva in Bnei Brak longer than Rabbi Shmuel Rozovsky.