Mayer Alter Horowitz

Mayer Alter Horowitz is an American Hasidic rabbi. Since 2009, he has been the Bostoner Rebbe of Jerusalem.

Mayer Alter Horowitz was born in Boston, Massachusetts, to Grand Rabbi Levi Yitzchak Horowitz, the second Bostoner Rebbe, and Raichel Unger Leifer. He is a ninth-generation descendant on the male line of Rabbi Shmuel Shmelke Horowitz, the Nikolsburger Rebbe (1726–1778). His older brother, Rabbi Pinchos Dovid Horowitz, is the Bostoner-Chuster Rav of Borough Park, Brooklyn, and his younger brother, Grand Rabbi Naftali Yehuda Horowitz, is the Bostoner Rebbe of Brookline, Massachusetts. His sister Shayna Gittel is married to the Vialopola Rebbe of Flatbush, and his sister Toba Leah is married to Dayan Rabbi Moshe Chaim Geldzheler of Jerusalem.

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

In the 1960s, after receiving his ordination, Horowitz returned to the United States and expanded the pioneering work of his father, the Bostoner Rebbe, in medical referral, by establishing Project ROFEH, which later evolved into what is currently known as R.O.F.E.H International, a community-based medical referral and hospitality liaison support agency. He continued to be active in the medical referral remotely from Israel until approximately 1999.

From 1969 to 1989 he was the Senior Rabbi of Congregation Beth Pinchas in Brookline, Massachusetts. With the backing of his father, he was one of the forces behind the establishment of Torah Academy of Boston in the 1980s.

The Israel Boston Chassidic Center complex on Ruzhin Street, Har Nof, Jerusalem

In 1984 he and a group of Bostoner Hasidim, with the leadership of his father, immigrated to Israel and helped found Mosdos Boston of Israel, which established the Bostoner community of Har Nof. He became the Senior Rav of the Givat Pinchas synagogue, and continues in that capacity today 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 shul 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, which includes Perush HaMeir, whose goal is to analyze and translate the Rambam's Mishneh Torah in Hebrew and English

Makeup of Moetzes Agudas Yisroel (February 2013)

In 2009, after the death of his father, he was designated to succeed his father in Har Nof. He also took his father's position as a member of the Moetzes Gedolei HaTorah of Agudath Israel of Israel.

Horowitz frequently travels to Jewish communities in Israel, Europe, and North America to introduce these communities to Bostoner Hasidut. Since becoming Bostoner Rebbe of Jerusalem in 2009, he has visited cities such as Waterbury, Connecticut, Chicago, Atlanta, Dallas, Denver, and Budapest, among others.

In the summer of 2012, Horowitz helped launch a weekly magazine publication in conjunction with the The Jerusalem Post called Kosher English, designed to help Israeli Haredi readers learn and improve their English-language skills; he continues to supervise its publication.

In the Bostoner tradition, Horowitz has composed dozens of original songs and melodies such as "Borey Niv" "Re'ay Nah" and "Yivorechicho"