During this time, he temporarily served as Sturmmann (Private) in the SS Division Leibstandarte[4] in an artillery regiment on the Eastern Front.

In July 1944, following an extensive period of recovery in various military hospitals, Beisheim served as a Private in an administrative unit before he was taken as a British prisoner of war in May 1945.

After several positions in the iron and steel industry, he worked for the electrical trading company Stöcker & Reinshagen from 1959, where he became an authorized officer.

[3] On 10 January 2004, Beisheim Center was officially opened on the northwest side of Potsdamer Platz in Berlin, built for 463 million euros, and including the Ritz-Carlton and Marriott chains.

[3] Otto gave his name to the Beisheim Group, a family holding company for his interests in Metro AG.