Avraham Yeshaya Karelitz, also known as the Chazon Ish after his magnum opus, was a Belarusian-born Orthodox rabbi who later became one of the leaders of Haredi Judaism in Israel, where he spent his final 20 years, from 1933 to 1953.

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".