Danish physician; born in Yaroslav, Galicia, 1764; died in Copenhagen 1811. He studied the Talmud for some years, but later devoted himself to medical studies, which he pursued at the universities of Breslau, Leipsic, and Halle, obtaining his diploma from the last-named.In 1792 he settled in Copenhagen, and in 1796 obtained permission to practise medicine in Denmark. In 1798 a royal patent assured him that his faith should prove no hindrance to his promotion.
Jacobi was a very active worker in the interests of his coreligionists. He acted as physician to the Jewish poor, and assisted in founding a free school for Jewish boys, as administrator of which he officiated until his death. During the last year of his life Jacobi was vice-president of the Danish Medical Society.