"In 1909, Rabbi Yitsḥak Ya‘akov Rabinovich founded a yeshiva called Ha-Kibuts ha-Ponivezhi" Mentioned in the intro to this group. A bio I found here: https://hevratpinto.org/tzadikim_eng/137_rabbi_yitzchak_yaakov_rabi... says he was son of R' Shmuel Leyb, and that he married Khava, daughter of R' Yakov Dov Eisenstadt, and that later, with R' Chaim Soloveitchik and R' Chaim Ozer Grodzinsky, he was a founder of Knesset Israel. And yet I cannot locate a profile on GENI. Can anyone help find R' Itsele Ponevezher on GENI? Thanks.
