(Elul 3, 5628 / 1868 - 156th Yahrzeit)
Rav Avrohom Tzvi Eisenstadt was born in 5573/1813. His father was Rav Yaakov of Bialystok, a descendant of Rav Meir Eisenstadt (the Ponim Meiros) and of Rav Hertz of Zalkova.
Rav Avrohom Tzvi was fluent in the entire Torah and a master of incisive thinking, as he demonstrated when he dissected deep sugyos.
His reference work Pis’chei Teshuva on Yoreh De’ah, a guide to the pesakim of many Acharonim, was written when he was just twenty-four years old. At that age, he was already serving as a Rav in Autian, Russia.
In 5619/1859, Rav Avrohom Tzvi published Pis’chei Teshuva on Even Ho’ezer, and just one year before his petira he published the last two sections on the remaining two sections of Shulchon Aruch, Orach Chaim and Choshen Mishpot.
Rav Avrohom Tzvi did a major service for Rabbonim by organizing and summarizing the pesakim of the authorities among the Rishonim and Acharonim. His works became very popular.
Rav Avrohom Tzvi also wrote Pis’chei Teshuva on the sefer Gittin Va’chalitza, explaining and citing the sources for every Halocha mentioned there; and Nachalas Shiva, on the works of the early Acharonim.
Rav Avrohom Tzvi was niftar on the 3rd of Elul, 5628/1868, at the age of fifty-five.
