A Talmid of Volozin. He was known as the "Genius from Bakst". At the age of 8 he was versed in most of Shas. At his Bar Mitzva he was considered a "Charif" and very knowledgable in all of Shulchan Aruch.
Before he was thirty he was appointed Rosh Yeshivas Slabodka and his brother in law, Maran Harav Isser Z. Meltzer, zt"l joined him very soon after.
When he was close to sixty he moved the Yeshiva to Chevron in Eretz Yisroel. A year later he travelled thru Eretz Yisroel to give Chizuk to those living in Eretz Yisroel. He was joined by Maran Harav Kook and Maran Harav Isser Zalman Mektzer Zt"l.
After the tragic slaughter in Chevron, where 24 Talmidim were killed. He moved the yeshiva to Yerushalayim.
He is the author of the popular sefer "Levush Mordechai".
YEHI ZICHRO BARUCH!!