Professor Dr. Klaus Töpfer is the founding Director and was until 30 September 2015 Executive Director of the Institute for Advanced Sustainability Studies (IASS) based in Potsdam. He is also the former Executive Director of the United Nations Environment Programme (UNEP) based in Nairobi and Under-Secretary-General of the United Nations (1998-2006). He has received numerous awards and honors. In 2012 he has been inducted in the “Kyoto Earth Hall of Fame”.
Photo rights: Schulzendorff