About Chaim Kanievsky
Shemaryahu Yosef Chaim Kanievsky (Hebrew: שמריהו יוסף חיים קַניֶבסקִי; January 8, 1928 – March 18, 2022) was an Israeli Haredi rabbi and posek. He was a leading authority in Haredi Jewish society on legal and ethical practice. Known as the Gadol HaDor ("greatest of his generation") and the "Prince of Torah", much of his prominence came through Torah education and advice about Jewish law. Though Kanievsky held no formal community-wide post, he was the de facto head of the Litvak community of Haredi Judaism, revered as a consummate scholar of Jewish law and tradition, with unimpeachable rulings. His father served as his sandek at his brit milah (circumcision) and named him Shmaryahu Yosef Chaim, after both his grandfathers: Shmaryahu Yosef Karelitz, the rabbi of Kosava, and Chaim Peretz Kanievsky.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.