Yechiel Fishel Eisenbach was a Haredi rabbi and long-time rosh yeshiva of Shaar Hashamayim Yeshiva in Jerusalem.
Background
He was born in Jerusalem to Rabbi Yosef Eisenbach, a sofer (scribe), and studied in the Talmud Torah and yeshiva of Shomrei HaChomot. 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.
Career
He was widely regarded as one of the greatest kabbalists in Israel, and was an expert in the writings of the Arizal and the siddur of the Rashash. 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. He was well known for his 18-hour day of learning, as well as his humility.
Occasionally he gave shiurim (lectures) on Torah and fear of God to unmarried students.
At different times, he served as mashgiach ruchani for the Slonim Yeshiva, and as maggid shiur (lecturer) for an elite group of students at Toras Emes. In 1973, Rabbi Refoel Dovid Auerbach of Shaar Hashamayim Yeshiva asked Rabbi Eisenbach to assume the mantle of rosh yeshiva after the passing of Rabbi Aharon Slotkin.
He knew all the writings of the Arizal and the siddur of the Rashash by heart, and was an expert in davening with the kavannot (mystical intentions) of these kabbalistic masters. His health progressively worsened in the two years before his death at the age of 83.
He was buried on the Mount of Olives.