Nissim Karelitz

Rabbi Karelitz (left) learning after praying in the morning

Karelitz was born in 1926 in Kosava (Kossov), Vilnius province, Poland, presently in Belarus. He came to Israel in 1935 with his parents.

Karelitz was a nephew of Rabbi Avrohom Yeshaya Karelitz, known as the Chazon Ish. (The latter's sister was Karelitz's mother).[2] The Chazon Ish was a previous rabbinical spiritual leader of Bnei Brak. From the time of the Chazon Ish until Karelitz it was Rav Elazar Shach who was regarded as the pre-eminent leader.

In his youth, he studied in the Ponevezh Yeshiva. He also studied with his uncles, the Chazon Ish and the Steipler. His wife Leah (d. 2015) was the daughter of Rabbi Tzvi Hirsch Kopshitz of Jerusalem and the great-granddaughter of Rabbi Yosef Chaim Sonnenfeld.[2][3]

Rav Karelitz died in Bnei Brak on October 21, 2019. His funeral by tens of thousands,[4] and he was eulogized by Rabbi Chaim Kanievsky, his first cousin, and by Rabbi Gershon Edelstein, Rosh Yeshiva of Ponevezh.

His rabbinical court handled various matters, including financial disputes, marriage conflicts, and conversions. He was also a member of the Vaad Halacha (Jewish legal council) of the Maayanei Hayeshua Hospital of Bnei Brak[5] and the av beis din of the Bnei Brak neighborhood of Ramat Aharon. Karelitz's beit din in Israel performs conversions on people who are residing illegally in the state of Israel.[6] This means several things: (1) The conversion process goes against Israeli law which gives the state more reason to reject such conversions. (2) The converts, who often live many years illegally in Israel, are eventually forced to leave (deportation, or due to lack of financial means to support oneself).[7]