 After apprenticing with Larsen & Andersens Møbelsnedkeri, Kbh and studying at the Technical Institute (Teknisk Institut), he was an independent master craftsman from 1909 - 1917.Between 1917 - 1928 he was the manager of A/S Lysberg & Hansen, a leading Danish furniture maker.In 1928 Weinreich established his own firm, A/S Normina.