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Grand Rabbi Mordechai Dovid Unger, Bobov-45 Rebbe

Bobov-45 (Hebrew: חסידות באבוב-45) is a Hasidic sect within Haredi Judaism. An offshoot of the Bobov Hasidic dynasty originating in Bobowa, Galicia, Southern Poland,[1] Bobov-45 is headquartered in the neighborhood of Borough Park in Brooklyn, New York. It has branches in Williamsburg, Monsey, Lakewood, Montreal, Toronto, Antwerp and London. In Israel, Bobov-45 has branches in Jerusalem, Bnei Brak, Ashdod, Elad, the settlement of Betar Illit, and an enclave in Bat Yam named Kiryas Bobov.

Mordechai Dovid Unger is the first and current, Grand Rabbi of Bobov-45. He is the younger son-in-law of the fourth Bobover Rebbe, Naftali Zvi Halberstam. Yehoshua Rubin, the older son-in-law of Halberstam, is the current dayan and rabbinical leader of the sect.


The third Bobover Rebbe, Shlomo Halberstam, rebuilt the Bobov Hasidic dynasty in the United States after losing his wife and most of his children in the Holocaust. His son Naftali survived.[2] The third rebbe remarried, and the union produced a son, Ben Zion Aryeh Leibish Halberstam, half brother to Naftali.[3]

Naftali became the fourth rebbe upon his father's death. He had no sons, but left 2 daughters, one of whom married Mordechai Dovid Unger, and the other Yehoshua Rubin.

In 2005, after the death of the fourth rebbe, a breakaway group of Bobover Hasidim loyal to his son-in-law, Mordechai Dovid Unger, set up a grand hall under his leadership on 45th Street in Borough Park, Brooklyn.[1] A leadership dispute then arose between Unger and Halberstam, who both claimed the title of Bobover Rebbe.

The dispute was taken to a beth din (arbitration panel), which ruled that the faction following Halberstam held the rights to the name "Bobov". Unger was also allowed to use the name Bobov, so long as a distinguishing identifier would be added to it.[4] The qualifying suffix "-45" was henceforth adopted in tribute to the name of the street on which the community center of the sect was located at the time. In addition, the beth din ordered Bobov to pay $6,200,000 to Bobov-45's Rebbe and dayan (rabbinic judge) in 25 quarterly installments as an allotment of their faction's share of the inheritance of the Bobov enterprise's assets, valued at the time at over $50,000,000[citation needed]. The award was based upon the number of members in the two communities.

As Bobov-45 rebbe, Unger has also been active in the wider Jewish community.[5]


Community institutions, such as a synagogue and mikveh, have been built within Bobov-45. Other infrastructure includes:

  • Yeshiva Ketana/Cheder[6][7]
  • Mesivta[8]
  • Bais Medrash[9]
  • Day camp[10]
  • Wedding halls:
    • 43rd Street and New Utrecht[11]
    • Torah Vyirah Hall[12]


Brooklyn Borough President Eric Adams visited Bobov-45 as part of his 2017 re-election campaign.[13]

Bobov-45 literature[edit]

In addition to those books revered by all Hasidim, the Bobov-45 Hasidim particularly treasure the teachings of the second Bobover Rebbe (published by the third Bobover Rebbe as Kedushas Tzion), and teachings of the third Bobover Rebbe Likutei Kerem Shlomo and Chochmas Shlomo (the latter published by Yechezkel Schlaff of London, affiliated with the court of Bobov-45).

Lineage of Bobov-45[edit]

Grand Rabbi
Yisroel ben Eliezer
Baal Shem Tov
founder of Hasidism
Grand Rabbi
Dov Ber
the Maggid of Mezritch
Grand Rabbi
Elimelech of Lizhensk
author of Noam Elimelech
Grand Rabbi
Naftali Tzvi Horowitz of Ropshitz
author of Zera Kodesh
Grand Rabbi
Chaim Halberstam of Sanz

author of Divrei Chaim
Myer Noson Halberstam

3. Grand Rabbi
Shlomo Halberstam

Third Bobover Rebbe
4. Grand Rabbi
Naftali Tzvi Halberstam

Fourth Bobover Rebbe
Female Halberstam
1. Grand Rabbi
Shlomo Halberstam

First Bobover Rebbe
author of Ateres Shlomo
eldest grandson of the Divrei Chaim
2. Grand Rabbi
Ben Zion Halberstam

Second Bobover Rebbe
author of Kedushas Tzion
5. Grand Rabbi
Ben Zion Aryeh Leibish Halberstam

(b. 1955)
Fifth Bobover Rebbe
Grand Rabbi
Mordechai Dovid Unger

(b. 1954)
Bobov-45 Rebbe
Rabbi Yosef Unger
Ruv of Beth Midrash Apirion Shel Shlome
Female Halberstam
Female Halberstam
Female Rubin
Rabbi Chaim Yaakov Tauber
Bobov Dayan
Rabbi Yehoshua Rubin (born 1952)
Bobov-45 Ruv
Rabbi Zvi Hirsh Rabinovich
present Ruv of Bobov Monsey Monsey
Female Halberstam
Female Rubin
Teacher → Student
Grand Rabbi
Yonasan Binyamin Goldberger
Rebbe of Bikofsk & present Rosh Hakolel of Bobov
Rabbi Meyer Yosef Eichenstein
Present Rosh Hakolel
Father → Son
Female Halberstam
Husband ↔ Wife
Rabbi Ben Zion Blum
Bobover Dayan of London
Female Halberstam
Rabbi Yaakov Yisroel Meisles
Bobover Ruv of Kiryath Bobov in Bat Yam
Female Halberstam
Rabbi Boruch Avraham Horowitz
present Rosh Yeshiva of Mesivta Eitz Chaim of Bobov
Rabbi Baruch Dovid Halberstam
Sorvosher Ruv
Rabbi Chaim Yehoshua Halberstam
Grand Rabbi
Yaakov Yosef Halberstam
Ruv of Beis Chaim Yehoshua
Grand Rabbi Chaim Yehoshua Halberstam
Grand Rebbe of Satmar in Monsey
Grand Rabbi Yechiel Halberstam
Pokshivnitzer Rebbe of Monsey, NY
Grand Rabbi Yechezkel Dovid Halberstam
Pokshivnitzer Rebbe
Grand Rabbi Chaim Halberstam
Pokshivnitzer Rebbe of Flatbush
Grand Rabbi Ben Zion Avraham Halberstam
Pokshivnitzer Rebbe of Flatbush
Grand Rabbi Shloime Halberstam
Pokshivnitzer Rebbe of Lakewood, New Jersey


  1. ^ a b "Naftali Halberstam Dies at 74; Bobov Hasidim's Grand Rabbi". The New York Times. March 25, 2005.
  2. ^ "The Life And Legacy Of Rabbi Shlomo Halberstam". August 1, 2008.
  3. ^ London,UK - "Chasidey Bobov-45 Beth Hamedrash" - " (The congregation should not be confused with the Beth Hemedrash of Kehal Chasidei Bobov of Egerton Road N16, which follows the leadership of the half brother of the Fourth Bobover Rebbe.)"Bobov Synagogue, Clapton Common, London". JCR-UK Jewish Communities & Records.
  4. ^ "Bobov-45 Rebbe dances at wedding". October 26, 2017.
  5. ^ "Jan 20, 2016 - The Bobov 45 Rebbe, Reb Mordche Duvid Unger Shlita, being Menachem Aveil the BMG Rish Yeshivah Harav Yerucham Olshin Shlita". January 20, 2016.
  6. ^ "Federal contract awards,..." "Contracting Profile: Yeshiva Ketana Of Bobov 45, Inc. Brooklyn NY".
  7. ^ "Science Fair at the Bobov-45 Cheider". March 14, 2016.
  8. ^ "BDE: Harav Mendel Gross, Menahel of Bobov-45 Mesivta". November 3, 2017.
  9. ^ "Driving directions to Bobov-45 Bais Medrash, Brooklyn, United States".
  10. ^ "Bobov 45 (BP) Day Camp Song '16 on Vimeo". June 28, 2016.
  11. ^ "Today is the wedding of a granddaughter of The Bobov-45 Rebbe Shlita ..." "Bobov 45 Wedding – Furshpeil". BoroPark24. May 27, 2018.
  12. ^ "Torah Vyirah Hall, Brooklyn, NY, 11219".
  13. ^ "Brooklyn Boro President Eric Adams Visits Bobov-45 Rebbe in Preparation to his Upcoming Re-election". September 28, 2017.