In 1998 Töpfer was appointed Under Secretary General of the United Nations, General director of the United Nations office in Nairobi and Executive Director of the United Nations Environment Programme.
Klaus Kinski | Klaus Schulze | Klaus Badelt | Klaus Barbie | Klaus Nomi | Klaus Mertens | Klaus Huber | Klaus Ebner | Václav Klaus | Klaus Ploghaus | Klaus Maria Brandauer | Klaus Knopper | Klaus Fuchs | Vaclav Klaus | Klaus Theweleit | Klaus Schwab | Klaus Biesenbach | Klaus Allofs | Klaus | Klaus Zmorek | Klaus Zehelein | Klaus Wowereit | Klaus Roth | Klaus Rifbjerg | Klaus Nordling | Klaus M. Leisinger | Klaus Meine | Klaus Klostermaier | Klaus Hoffmann | Klaus Hildebrand |