After it merged with the Dresdner Bank, Reinhart went to work for the Mitteldeutsche Creditbank [de] of Frankfurt and Berlin, as a director and member of the management board (Vorstand) from 1910 to 1929.
[2] In an attempt in January 1920 to get a number of banks to support the Kapp Putsch against the government of the Weimar Republic, Reinhart expressed his approval in writing.
[4] On 21 October 1931, Reinhart was among 25 leaders of industry, banking, labor and agriculture who were named by Reich President Paul von Hindenburg to an economic advisory board to address problems in the German economy.
The board was charged with deciding the manner and degree to which prices and wages would be reduced in accordance with Reich Chancellor Heinrich Brüning's deflationary policy.
[5] Subsequently, Reinhart published an article in the Frankfurter Zeitung on 8 February 1932, launching a campaign for German economic self-sufficiency and calling for rearmament and imperialism.
[8] After the Nazi seizure of power, Reinhart in April 1933, was appointed to the Generalrat der Wirtschaft [de] (General Economic Council), a short-lived group of industrialists, bankers and politicians established to advise the government on matters related to the economy.