Yaakov Yisrael Kanievsky, known as The Steipler or The Steipler Gaon, was a Haredi rabbi, Talmudic scholar, and posek ("decisor" of Jewish law), and the author of Kehilos Yaakov, "a multi-volume Talmudic commentary".

The Novardok Yeshiva was one of the largest and most important yeshivas in pre-World War II Europe, and a force within the Mussar movement. It was the first of hundreds of a network of Musar yeshivas that were all called Novardok yeshivas.