chaim avrohom horowitz (1933 – 2016) was a polish-born american rabbi. in 1985 he became bostoner rebbe, grand rabbi of the boston jewish hasidic sect, established in 1915 by his grandfather pinchas duvid horowitz, and named after his city, boston, massachusetts, usa. he was a student of aharon kotler. after the death of pinchas duvid in 1941 his eldest son, moshe horowitz (1909-1985), held the position of bostoner rebbe in new york until his death in 1985, following chasidic tradition.