Wewer was born in
Kleve. He was probably called to
Copenhagen by
Michael Fabritius with whom he founded Fabritius & Wewer in 1740. There was an attempt to set up a trade route to the
Levant, but the company prospered from trade on the Danish colonies.
Peter Fenger and
Johann Ludvig Zinn both worked for the firm in the beginning of their careers. Wewer was also active in most of the chartered companies of his time. He served as one of the directors of the
Danish West India Company from 1746 and was from 1752 also one of the directors of the
Danish Asia Company. In 1754, he purchased the Danish West India Company's buildings and quay at Christianshavn. He was also involved in the
Royal Greenland Trading Department and was in 1755 appointed as director of the Danish Africa Company. He was appointed as royal agent in 1743 and as in 1754. ==Other activities==