Master of Science in Earth Sciences, Vrije University, Amsterdam, 1992. Master of Science Environmental Sciences, University East Anglia, Norwich, United Kingdom, 1996. Doctor of Philosophy in Geography, Christian Albrechts University, Kiel, Germany, 2003.
Assistant campaigner Greenpeace, Amsterdam, 1992. Research associate Institute for Environmental Studies, Vrije University, 1992-1998. Science officer Coastal Zone Management Center, The Hague, 1993-1995.
Senior research associate Potsdam Institute for Climate Impact Research, since 1999. Consultant United Nations Development Programme, United Nations Environment Programme, UNFCCC, GEF, World Bank, European Union, Dutch and German governments, since 1995. (coordinating) lead author IPCC, Geneva, since 1994.