Yitzchok Zev Soloveitchik

Yitzchok Zev Halevi Soloveitchik (Hebrew: יצחק זאב הלוי סולובייצ'יק), also known as Velvel Soloveitchik ("Zev" means "wolf" in Hebrew, and "Velvel" is the diminutive of "wolf" in Yiddish) or as the Brisker Rov ("rabbi of/from Brisk", (19 October 1886, Valozhyn – 11 October 1959, Jerusalem), was an Orthodox rabbi and rosh yeshiva of the Brisk yeshiva in Jerusalem, Israel. He was a son of Rabbi Chaim Soloveitchik of Brisk. He is also commonly referred to as the GRYZ, an acronym for Gaon Rabbi Yitzchok Zev ("sage Rabbi Isaac Wolf") and "The Rov".