In 1973, he moved from the banking business to the paper processing industry in Berlin. He became a board member of Kroch companies, including "AG für Haus- und Grundbesitz. For ten years worked on the restitution of looted art of the property aryanized from the Kroch family during the Nazi era. He is involved in various Kroch companies as a member of the supervisory board. Hans-Otto Spithaler and the journalist
Monika Zimmermann, wrote a history of the Jewish family business Kroch in
Leipzig with its headquarter in the
Kroch High-rise and its destruction under National Socialism. == Literature ==