| | until 1985 Lecturer at Leuven University (KU Leuven)and at Vlekho Commerce School in Brussels (Belgium)
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| 1985 | Economist at International Monetary Fund (IMF) in Washington (USA)
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| since 1986 | Administrator in the European Commission
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| 1994-1998 | Head of Unit "Economic Analysis and Environmental Perspective" at Directorate of Environmental Instruments at DG ENVIRONMENT
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| 1999-2003 | Head of Unit "Climate Change", DG ENV; Chief negotiator of the Commission at the UNFCCC Conference of the Parties on Climate Change
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| 2002 | Head of Task Force during World Summit on Sustainable Development in Johannesburg (Republic of South Africa)
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| 2003-2005 | Director of Air Quality, Climate Change, Chemical Substances and Biotechnology, DG ENV
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| 2005-2006 | Director of Air Quality and Chemical Substances, DG ENV
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| 2006-2008 | Director of Climate Change and Air, DG ENV
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| 2008 | Acting Director General of DG ENV
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| 2008-2010 | Deputy Director General, DG Environment (ENV)
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| since 2010 | Director General, Directorate General (DG) Climate Action, European Commission
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| 2013 | Lecturer at Leuven University (KU Leuven)on European and international environmental policy |
