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