Born in Oreno, near Milan, was the brother of future bishop Domenico Bernareggi.After a few years, Father Agostino Gemelli offered him a post as professor of ecclesiastic law at Catholic University in Milan.Cardinal Achille Ratti named him pastor at San Vittore al Corpo in Milan.On 16 December Pope Pius XI appointed him coadiutor bishop with right of succession of the Roman Catholic diocese of Bergamo.During his episcopacy in the territory of the diocese reported visions of Our Lady of Ghiaie di Bonate occurred.