| 1969-1973 | Assistant/Associate Professor, Ecole Polytechnique, University of Montreal |
| 1973-1977 | Director of Studies, Tele-universite, University of Quebec |
| 1978-1980 | Vice President, Learning Services, Athabasca University, Alberta |
| 1980-1984 | Vice-Rector, Academic, Concordia University, Montreal |
| 1984-1990 | President, Laurentian University, Ontario |
| 1990-2001 | Vice-Chancellor, The Open University, Milton Keynes |
| 2001-2004 | Assistant Director General for Education, UNESCO, Paris |
| 2004-2012 | President, Commonwealth of Learning, Vancouver |
| 1973 | MA in Physics, University of Vienna |
| 1977 | Ph.D. in Physics, King's College, Cambridge University |
| 1978-1984 | Co-founder (later Chairman); Lead, Research and Development team (BBC micro); Head, team ARM micro processor; Acorn Computers, Cambridge |
| 1986 | Vice President Research, Olivetti, Ivrea, Italy |
| Founder Director, Harlequin, Cambridge |
| 1987 | Helped with formation, a joint venture between Acorn and Apple Computers, ARM Ltd, Cambridge |
| 1988 | Founder, Active Book Company, Cambridge |
| 1991 | Co-Chairman and Chief Technology Officer - acquired Active Book Company, EO Incorporated, Mountain View, California |
| 1992 | Founder Director, Vocalis, Cambridge |
| 1993 | Founder and Chairman, Advanced Telecommunications Modules Ltd, Cambridge (changed name to Virata Corporation and merged with Globespan in 2003 and Conexant in 2004) |
| Founder Director, joint venture with E*Trade US. Sold to E*Trade US in 2000, Electronic Share Information Ltd, Cambridge |
| Founder Director - Acquired by CDT, Advanced Displays Ltd, Cambridge |
| Founder Director, SynGenix, Cambridge |
| 1996 | Founder, NetChannel, San Francisco, California (sold to AOL in 1998) |
| since 1997 | Co-founder and Partner, Amadeus Capital Partners Limited |
| 1998 | Co-founder, Cambridge Network Ltd, Cambridge |
| 1980 | Magister (M.A.), Social and Economic Statistics, University of Vienna |
| 1981-1982 | Research Assistant, Population Studies Center/Graduate Group in Demography, University of Pennsylvania |
| 1982 | M.A., Demography, University of Pennsylvania |
| 1983 | Ph.D. (with distinction), Demography, University of Pennsylvania |
| 1983-1985 | Research Associate, Demographic Institute, Austrian Academy of Sciences; Lecturer in Social and Economic Statistics, University of Vienna |
| 1984 | Visiting Scholar, World Fertility Survey, London |
| since 1984 | Employed at IIASA - International Institute for Applied Systems Analysis, Laxenburg |
| 1988 | Habilitation, Demography and Social Statistics, University of Vienna |
| since 1988 | Leader, World Population Program, IIASA, Laxenburg |
| 1995-1998 | Research Director, Austrian Institute for Family Studies, Vienna |
| 1998-2001 | Secretary General, International Union for the Scientific Study of Population (IUSSP) |
| 1999-2004 | Scientific Coordinator, EU Observatory for the Social Situation, Demography and the Family |
| 2001-2002 | Initiator and Coordinator, Global Science Panel on Population and Environment |
| since 2002 | Director, Vienna Institute of Demography (VID), Austrian Academy of Sciences, Vienna |
| 2007 | Senior Visiting Fellow, Oxford Institute of Ageing, Oxford University |
| 2002-2009 | Deputy Chair, Board of Directors and Chair of the Scientific Program Committee, African Population and Health Research Center (APHRC), Nairobi, Kairo |
| 2003-2008 | Member, Board of Directors (Kuratorium), Max Planck Institute for Demographic Research, Rostock |
| since 2008 | Full Professor of Social and Economic Statistics (part time), Vienna University of Economics and Business |
| 2011 | Founding Director, Wittgenstein Centre for Demography and Global Human Capital (IIASA, VID/ÖAW, WU) |
