National Trust for Places of Historic Interest or Natural Beauty | Advisory Committee on Antarctic Names | International Olympic Committee | American Museum of Natural History | Committee of Public Safety | UK Antarctic Place-Names Committee | United States Department of Energy | Natural History Museum | International Atomic Energy Agency | United Nations Industrial Development Organization | Republican National Committee | Leadership in Energy and Environmental Design | International Development Association | United Nations Conference on Trade and Development | Central Committee | International Bank for Reconstruction and Development | Democratic National Committee | International Fund for Agricultural Development | natural history | Department of Energy | African Development Bank | Field Museum of Natural History | USL Premier Development League | United States Agency for International Development | natural gas | Natural environment | Integrated development environment | House Un-American Activities Committee | National Museum of Natural History | International Committee of the Red Cross |
He has served on numerous national and international boards and working groups, including the board of the Netherlands' Physical Society (NNV), the Dutch division of the International Solar Energy Society, the working group on renewable energy of the World Energy Council, the working group on energy supply mitigation options of the Intergovernmental Panel on Climate Change, and the Committee on Energy and Natural Resources for Development of the United Nations (UN-CENRD).