Rabbi Simcha Zelig Reguer (1864-1942), שמחה זעליג ריגר Dayan of Brisk, was the chief Rabbinical judge of Brest-Litovsk and surrounding Lithuania.
[1] Rabbi Reguer and his family lived in the same house (but on separate floors) as Rabbi Chaim Soloveichik,[2] head of the Volozhin Yeshiva, and his family.
In his memoir, Menachem Begin recalls how Nazi soldiers publicly humiliated Rabbi Reguer in the town square, and slashed his beard.
[3] Rabbi Reguer perished in the holocaust along with most of his community.