| 1973-1984 | Research Scholar, Energy Systems Program, IIASA |
| 1984-1986 | Research Scholar, Science and Technology Program, IIASA |
| 1986-1991 | Leader, The Dynamics of Technological Project, IIASA |
| Acting Leader, Technology, Economy and Society Program, IIASA |
| 1991-2000 | Leader, Environmentally Compatible Energy Strategies Project, IIASA |
| 1993-1995 | Convening Lead Author, Second Assessment Report IPCC - Intergovernmental Panel on Climate Change |
| 1993-1998 | Director, Global Energy Perspectives, WEC - World Energy Council |
| 1993-2003 | Guest Professor, Technical University of Graz |
| 1997-2000 | Coordinating Lead Author, Special Report on Emissions Scenarios, IPCC |
| 1998-2000 | Convening Lead Author, WEA - World Energy Assessment |
| 1998-2001 | Lead Author, Third Assessment Report of the IPCC |
| 2003-2005 | Coordinating Lead Author, MEA - Millennium Ecosystem Assessment |
| 2003-2007 | Co-Leader, Greenhouse Gas Initiative Program, IIASA |
| 2000-2008 | Leader, Transitions to New Technologies Program, IIASA |
| since 2003 | University Professor of Energy Economics, VUT - Vienna University of Technology |
| since 2005 | Director, GEA - Global Energy Assessment |
| since 2009 | Deputy Director, IIASA |
| since 2010 | Lead Author, Fifth Assessment Report, IPCC |
| | studied Mathematics at Trinity College, Cambridge |
| 1968 | Research Fellow, Caltech |
| 1967-1969 | Fellow, Jesus College, Cambridge |
| 1967-1972 | Staff member, Institute of Theoretical Astronomy, Cambridge |
| 1969-1992 | Senior Research Fellow, King's College, Cambridge |
| 1969-1970 | Member, Institute for Advanced Study, Princeton, New Jersey |
| 1971 | Visiting Associate Professor, Caltech |
| 1972 | , 1988-89 Visiting Professor, Harvard University |
| 1972-1973 | Professor, Sussex University |
| 1976-1977 | Gresham Professor of Astronomy |
| 1982 | , 1996-1997 Visiting Professor, Institute for Advanced Study, Princeton |
| 1984 | Joint Coordinator of programme on galaxy formation, etc. at Institute of Theoretical Physics, Santa Barbara |
| 1984-1988 | Regents Visiting Fellow of Smithsonian Institution |
| 1973-1991 | Plumian Professor of Astronomy and Experimental Philosophy, Cambridge University |
| 1977-1982 | , 1987-91 Director, Institute of Astronomy |
| 1973-1991 | Professorial Fellow, King's College, Cambridge |
| 1992-2003 | Royal Society Professor at Cambridge University |
| Official Fellow King's College, Cambridge |
| 1995 | JSPS visitor, Kyoto University |
| 2002-2009 | Professor of Cosmology and Astrophysics, Cambridge |
| 2004-2012 | Master of Trinity College, Cambridge |
| since 1995 | Astronomer Royal |
| since 2001 | Honorary Professor, Imperial College, London and Leicester University |
| since 2012 | Fellow of Trinity College, Cambridge |
| | Studium Politikwissenschaft und Geschichte in Wien, Granada, Guatemala |
| 1995-1996 | Menschenrechtsbeobachterin in Guatemala |
| 1998-2002 | Pressesprecherin und Globalization Officer beim WWF Österreich |
| seit 2003 | Journalistin und Autorin mit den Schwerpunkten Globalisierung, Menschenrechte, Migration |
| Politikredakteurin beim Wirtschaftsmagazin Format |
| 2006-2008 | Recherchen, Beratung und Aufnahmeleitungen für den Dokumentarfilm "Let's Make Money" von Erwin Wagenhofer |
| 2007-2012 | Moderation, Club 2, ORF |
| 2010-2012 | Stellvertretende Chefredakteurin, News |
| seit 2012 | Moderatorin, Pro und Contra - Der AustriaNews Talk, PULS 4 |
| seit 2013 | Informationsdirektorin, Prosieben Sat1 PULS4 |
| 2013-2014 | Moderatorin, "Die letzten Zeugen" von Doron Rabinovici und Matthias Hartmann, Burgtheater Wien |
