Yitzchok Zev Soloveitchik was born to
Chaim Soloveitchik in
Valozhyn. 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. ==Brisker rabbinic dynasty==