2012 - Adjunct Professor at Reykjavik University, Reykjavik, Iceland
2011 – Manager R&D, Geothermal Competence Center, Gas and Process Division, Atlas Copco Energas GmbH
2011 Director Research and Development, Enex ehf, Reykjavik.
2009 – 2010 Director Research and Development, Green Energy Group AS, Oslo, Norway.
2009 – Owner, consultant, innovator at Scio Domo (now P.Vald ehf) and co-owner Kreo Domo (now Enex ehf), Reykjavik.
2007 – 2009 Director Research and Development, Enex Ltd, Reykjavik.
2006 – Consultant (STC) on Gethermal Utilization to the World Bank, Washington, USA. Missions to Armenia and Poland.
2003 – 2004 Member of the Icelandic Aircraft Accident Investigation Board, consultant to the Board and substitute member from 2004.
2002 – Member of the United Nations University Geothermal Training Programme study board.
2000 – 2007 Consultant to VGK, X-Orka and Enex, Reykjavik, on geothermal power production.
1997 – 2002 Member of the scientific council of the Process Integration Research Programme of the Nordic Council of Ministers Energy Research Programme.
1996 – 2012 Professor at the University of Iceland.
1996 – Consultant to nv NUON Technisch Bedrijf, Arnhem, Holland on district heating network calculation.
1993 – 1995 President of the Icelandic Council for Standardization.
1987 – 1996 Representative of the Icelandic Association of Chartered Engineers in the Icelandic Council for Standardization.
1987 – Lecturer in Geothermal Utilization at the United Nations University Geothermal Training Programme.
1986 – 1995 Researcher at the University of Iceland in the field of District Heating Engineering in a position sponsored by the Nordic Council of Ministers Energy Research Programme.
1983 – Lecturer at the University of Iceland, Faculty of Engineering in the field of applied thermal science.
1982 – 1986 Power plant engineer at Icelandair, Reykjavik.
1980 – 1982 International Power Engineering in Copenhagen, in the field of marine diesel engine design and operation.
1977 – 1979 Part time work at VGK Consulting Engineers in the field of Geothermal Utilization.