| 1985-1993 | PhD student and researcher, Slovak Academy of Sciences
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| 1993-2006 | Teaching and research of natural nano-particles and their industrial and environmental applications, environmental impact of the waste including possible remediation approaches, Comenius University
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| 2004-2005 | Principal advisor for European Affairs to the Minister of Research and Education of the Slovak Republic
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| 2005-2006 | Director, APVV - Slovak Research and Development Agency
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| 2006-2012 | Director, Directorate General EAC - Education and Culture
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| 2012-2013 | Deputy Director-General, JRC - Joint Research Centre, Brussels
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| since 2014 | Director-General, JRC - Joint Research Centre |
| 1990-1995 | Research Fellow, Department of Economics, Birkbeck College, University of London
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| 1991-1995 | Research Associate, Department of Applied Economics, University of Cambridge
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| 1996 | Ph.D., Economics, University of London
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| 1996-2002 | Senior Lecturer, Reader and Professor of Sustainable Development, Keele University
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| 1998-2005 | Specialist Advisor, Environmental Audit Committee, House of Commons, London
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| 2000-2007 | Head of Environment Group, Policy Studies Institute, Professor of Sustainable Development, University of Westminster
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| 2002-2008 | Member, Royal Commission on Environmental Pollution, London
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| 2006-2010 | Chairman, National Industrial Symbiosis Programme (NISP), London
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| 2008-2009 | Professor, Energy and Environment Policy, King's College London
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| since 2009 | Professor, Energy and Environment Policy, Energy and Environment Policy, Director, UCL Institute for Sustainable Resources, University College London
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| since 2010 | Fellow, Energy Institute, London
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| 2011-2014 | Vice-Chairman, DG Environment, Commissioner's High-Level Economists Expert Group on Resource Efficiency and Member, European Resource Efficiency Platform
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| since 2013 | Member, UNEP International Resource Panel, Paris |
| 1991-1995 | Researcher, German-French Environmental Research Institute, Karlrsuhe
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| 1991-1995 | Doctorate, Technical University Karlsruhe
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| 1995-1997 | Consultant, United Nations Institute for Training and Research (UNITAR), Mexico City
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| 1997-1999 | Officer, National Environmental Council
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| 1997-1999 | Professor, Pontificia Universidad Catolica del Peru, Lima
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| 2000-2001 | Project Officer, Wuppertal Institute for Environment, Climate and Energy, Wuppertal
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| 2001-2004 | Project Coordinator, Swiss Chamber of Commerce Peru, Lima
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| 2005-2014 | Programme Officer, United Nations Environment Programme (UNEP) and coordinator, UNEP/SETAC Life Cycle Initiative, Paris
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| since 2014 | Program Manager, World Resources Forum, Switzerland, Coordinator, Roundtable on Sustainable Recycling Industries (SRI) |
