After four years in Hamburg, Adler continued to London where, in 1848, an inheritance of about 30,000
rigsdaler enabled him to become a partner in the commission house Martin Levin & Adler. In 1850 he returned to Copenhagen. He founded the banking house of D. B. Adler & Co. on 22 February 1850. Martin Levin was a silent partner in the company, just as Adler remained a silent partner in the London enterprise for a few more years. Together with Tietgen he was a driving force behind the foundation of
Privatbanken in 1868. He was a member of its governing board until disagreements with Tietgen made him resign in 1876. On 18 April 1875, after years of preparations in secrecy, Adler founded Kjøbenhavns Handelsbank. The board of directors consisted of national bank directors W. Sponneck and A.E. Reimann as well as state loans director Martin Levy. Adler was later also a co-founder of several credit and banking houses in
Jutland, including Nye Jyske Købstadskreditforening (1871) on the basis of the firm Adler, Wulff & Meyer in
Aarhus Jysk Handels- og Landbrugsbank (1876). Adler was a member of the
Maritime and Commercial Court from 1862 to 1877. He was a member of
Grosserer-Societetet's governing committee from 1875 to 1878. He was also a member of several legislative commissions and exhibition committees. He was a member of the Mosaic (Jewish) community's board of representatives from 1870 to 1877. ==Politics==