Yitzchok Zev Soloveitchik

Yitzchok Zev Halevi Soloveitchik, also known as Velvel Soloveitchik or the Brisker Rov, was an Orthodox rabbi and rosh yeshiva of the Brisk yeshiva in Jerusalem.
A scion of the Soloveitchik rabbinical dynasty, he is commonly referred to as the "GRY"Z" and "The Rov". He was known for his stringency in halakha and advocacy for non-participation in the Israeli political system.

Biography

Yitzchok Zev Soloveitchik was born to Chaim Soloveitchik in Valozhyn. On his mother's side, he was the grandson of Refael Shapiro, a rosh yeshiva in the Volozhin yeshiva.
Soloveitchik moved with his family to the Jewish community of Brisk after the czarist government closed the Volozhin yeshiva. He would succeed his father as a rabbi of Brisk and leader of Judaic studies in his region.
After fleeing the Holocaust and moving to Mandatory Palestine, he re-established the Brisk yeshiva in Jerusalem.
After Soloveitchik's death in 1959, his son Berel took over his father's position as rosh yeshiva of Yeshivas Brisk. Another of his sons was Meshulam Dovid Soloveitchik.
Soloveitchik did not recite from memory when speaking, he read all his sources from their original works.