The Israel Boston Chassidic Center complex on Ruzhin Street, Har Nof, Jerusalem
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.
As Grand Rabbi
In 2009, after the death of his father, he was designated to succeed his father in Har Nof.[5] He also took his father's position as a member of the Moetzes Gedolei HaTorah of Agudath Israel of Israel.
In the summer of 2012, Horowitz helped launch a weekly magazine publication in conjunction with The Jerusalem Post called Kosher English, designed to help Israeli Haredi readers learn and improve their English-language skills, and supervises its publication.[11]
In the Bostoner tradition, Horowitz has composed dozens of original songs and melodies[12] including "Borey Niv"[13] "Re'ay Nah"[14] and "Yivorechicho"[15]
