| 1974-1979 | M.Sc. and B.Sc., Massachusetts Institute of Technology, Cambridge, MA
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| 1979-1983 | Director, Energy for my Neighbour Programme, World Council of Churches (WCC), Geneva
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| 1983 | Research Fellow, Beijer Institute, Stockholm
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| 1984-1986 | Senior Programme Officer Energy, World [Brundtland] Commission on Environment and Development (WCED), Geneva
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| 1986-1989 | Programme Officer Energy, United Nations Environment Programme (UNEP), Nairobi
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| 1989-1990 | Research Associate, Stockholm Environment Institute Boston Center, Boston
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| 1990-1993 | Senior Programme Officer, UN Conference on Environment and Development (UNCED), Geneva and Rio de Janeiro
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| 1993-2007 | Various positions, UN Climate Change Secretariat (UNFCCC), Geneva and Bonn
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| 2007-2008 | Director, UN Environment Management Group (EMG), UNEP, Geneva
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| 2008-2010 | Director, UN Secretary-General's Climate Change Support Team, United Nations, New York
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| 2010-2012 | Executive Secretary, UN Secretary-General's High-level Panel on Global Sustainability, New York
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| 2012-2015 | Acting Executive Director for Conservation, WWF International, Gland
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| 2015-2016 | UN Assistant Secretary-General on Climate Change, United Nations, New York |
