 He was born in Jerusalem to Rabbi Yosef Eisenbach, a "sofer" (scribe), and studied in the Talmud Torah and yeshiva of Shomrei HaChomot.He was also one of the first students of Yeshivat Beit Avraham-Slonim, which was then led by Rabbi Sholom Noach Berezovsky, the Rebbe of Slonim.After his marriage in 1944 to the daughter of Rabbi Asher Zelig Margolios, a noted kabbalist, Rabbi Eisenbach studied at the Pressburg Yeshiva under Rabbi Akiva Sofer (the Daas Sofer); the Toras Emes (Chabad) yeshiva; and Kollel Shomrei HaChomot.