He has been science adviser to the World Energy Council and special adviser to select committees of both the House of Lords and the House of Commons as well as serving on several Cabinet and Research Council committees.
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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).