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Mr. Rosen studied economics at the State University of New York and earned an MBA from the University of Michigan.

Mr. Rosen began his professional career in 1981 at Republic Steel Corporation, USA. In 1984 he moved to American Hoechst/Hoechst Celanese Inc. In 1994 he moved to Hoechst AG in Frankfurt am Main. After the merger of Hoechst AG with Rhône Poulenc, Mr. Rosen worked for Aventis SA for three years. In 2003 he moved to the Management Board of Fresenius Medical Care AG & Co. KGaA. From 2009 to 2016 he was a member of the Management Board of Deutsche Post AG.