Peter Loescher is former president, Global Human Health at Merck & Co. He was appointed Chief Executive Officer (CEO) of Siemens in May 2007, being the first top executive in the 160-year history of Siemens to be hired from outside the company.

From 1988 until 2000 he worked for the German pharmaceutical company Hoechst in Spain, Japan, Great Britain and the United States. After Hoechst merged with Rhone-Poulenc he stayed at Aventis until 2002. He then joined Amersham, which was taken over by General Electric. In 2006 he became a member of the executive board of the U.S. pharmaceutical company Merck.

Peter Loescher obtained his Master's degree at the Vienna University of Economics and Business Administration. In 2007 he received the honorary degree of Doctor of Engineering from Michigan State University. He also speaks German, English, French, Spanish, and Japanese.