Mayer Alter Horowitz

Horowitz was born in Boston, the son of Levi Yitzchak Horowitz, the second Bostoner rebbe, and Raichel Unger Leifer.^[2] He is a ninth-generation descendant in the male line of Shmuel Shmelke Horowitz, the Nikolsburger rebbe. His older brother, Pinchos Dovid Horowitz, was the Bostoner-Chuster rabbi of Borough Park, Brooklyn, and his younger brother, Naftali Yehuda Horowitz, is the Bostoner rebbe of Brookline, Massachusetts.

Horowitz received his rabbinic ordination at the Ponevezh Yeshiva in Bnei Brak and Beth Medrash Govoha in Lakewood, New Jersey.^[3]

From 1969 to 1989 he was the Senior Rabbi of Congregation Beth Pinchas in Brookline, Massachusetts.^[4]

In 1984 he and a group of Bostoner Hasidim immigrated to Israel and helped found Mosdos Boston of Israel, which established the Bostoner community of Har Nof. He became the Senior Rabbi of the Givat Pinchas synagogue, continuing in that capacity as Bostoner Rebbe of Jerusalem. In 1980, Horowitz helped establish Kollel Boston in the Bukharim quarter of Jerusalem. The Kollel moved to Har Nof with the establishment of the Bostoner community there.

From 1984 to 1989, Horowitz traveled back and forth between Boston and Har Nof, and beginning in 1989 settled permanently in Har Nof. In the late 1980s, he established a second synagogue in Har Nof, called Beis Shlomo, and continued as Senior Rabbi until 1995.

In 1998, he helped his father establish the Bostoner Community in Beitar Illit.

In 2007, he founded Machon HaNesher HaGadol, a publication company.