Rural Regional Development Department, GIZ, in Germany. From 1991 to 1997 worked for the International Union for Conservation of Nature (IUCN) in Southern Africa and Washington, D.C. was also a Chief Technical Adviser of the Mekong River Commission (1997–1998) before becoming Secretary-General of the World Commission on Dams. In 2001 returned to IUCN as Director-General.