Sassov (Hasidic dynasty)

The Sassov (also Sassow) Hasidic dynasty began with Rabbi Moshe Leib Erblich of Sassov (1745–1807), a disciple of Rabbi Dovber of Mezeritch, the disciple of the Baal Shem Tov, the founder of Hasidism.
Sassov was located in Eastern Galicia, and is now in Ukraine.
Subsequent Sasover Rebbes.
There was a Sassover Rebbe in Monsey, New York, Grand Rabbi Yaakov Tzvi Erblich (d. 2020), who was a son of Grand Rabbi Moshe Yehudah Erblich (d. 1991), Sassover Rebbe, son of Grand Rabbi Yaakov Tzvi Erblich, Porosover Rebbe, son of Grand Rabbi Yekusiel Shmelka Erblich (1800–1861), son of Rebbe Moshe Leib Sassover (1745–1807), founder of the Sassov dynasty.
Grand Rabbi Yoel Meir Erblich of Elizabeth, NJ leads a neo-hassidic following and is beloved by hassidim and non-hassidim alike. He is known for his wide ranging knowledge of the entire corpus of revealed and hidden Torah, and for the unassuming manner in which he conducts his hassidic court. His lineage is as follows: Son of Grand Rabbi Baruch Erblich, son of Grand Rabbi Moshe Yehudah Erblich (d. 1991), Sassover Rebbe, son of Grand Rabbi Yaakov Tzvi Erblich, Porosover Rebbe, son of Grand Rabbi Yekusiel Shmelka Erblich (1800–1861),son of Grand Rabbi Alter Morderchai, son of Grand Rabbi Shmelka, son of Rebbe Moshe Leib Sassover (1745–1807), founder of the Sassov dynasty.
Family of Mahari"m Erblich.
The wife of Grand Rabbi Yoel Meir, Rebbetzin Bryna, is unusual for a Hassidic Rebbetzin, in that she descends from a non-Hasidic background, and holds a PhD in human biology.
The daughter of Mahari”m HaKadosh, Maiden of Sassov, Rebbetzin Shoshana Shifra shtlit”a, is well known in her own right as an expert in tora teachings, possibly preeminent in her generation. A “baalas ruach haKodesh,” she is sought out for her wisdom and counsel. 
In the late 19th century, the descendants of Rabbi Moishe Leib of Sassov had become rabbis in other cities. The town people found themselves without a Rebbe. They asked Rabbi Sholom Rokeach, known as the Sar Shalom of Belz, for guidance as to whom to appoint as Rebbe. He advised them to nominate his grandson, Rabbi Shlomo, who, although not from the lineage of the Sassover dynasty of Rebbe Moshe Leib, appropriated the title "Rebbe of Sassov". Rabbi Shlomo's father was the first Rebbe of Alesk and his mother was the daughter of the Sar Shalom. Rabbi Shlomo died in 1919. Rabbi Lipa Meir Teitelbaum, a great-grandson of Rabbi Shlomo "of Sassov" and the founder of Kiryat Yismach Moshe in Ganei Tikva, in Israel, was the "Sassov"-Keretzky Rebbe. In his first marriage, he was the son-in-law of Rabbi Joel Teitelbaum of Satmar. He died in March 1966, and was subsequently succeeded by his two sons (both from his second marriage to Rebbetzin Bluma): Grand Rabbi Yoseph Dovid Teitelbaum, the "Sassover Rebbe" in Kiryat Yismach Moshe and a son-in-law of Grand Rabbi David Moshe of Kretchnif (Rabbi Yoseph Dovid was a disciple of the previous Klausenberger Rebbe) and Rabbi Chanoch Henoch Teitelbaum, the "Sassover Rebbe" in Monsey, New York.
COVID 19 Controversy.
In December 2020, Rabbi Yosef Dovid Teitelbaum made a statement discouraging vaccination against COVID 19, and stated that "the doctors are murderers." 
In response, Grand Rabbi Yoel Meir Erblich shlit"a announced that this opinion flies in the face of the true Sassover tradition, medical science, and common sense, and the true murderers are those who oppose vaccination. Grand Rabbi Erblich further stated that it is a great mitzva to be vaccinated.