| 1954 - 1959 | Trainee Engineer at AWA Ltd. (Amalgamated Wireless Australasia) |
| 1958 | Bachelor of Science (BSc) completed at the University of Sydney |
| 1958 - 1960 | Bachelor of Engineering (BE) completed at the University of Sydney |
| 1960 | Engineer with the Overseas Telecommunications Commission |
| 1960 - 1961 | Applications Engineer at Ducon Industries |
| 1961 - 1963 | Research Assistant then Senior Research Assistant in the School of Engineering at the University of Sydney |
| 1963 - 1967 | Nuttfield Research Fellow at the University of Sydney |
| 1967 | Doctor of Philosophy (PhD) completed at the University of Sydney |
| 1968 - 1974 | Lecturer then Senior Lecturer in Electrical Engineering at the University of Sydney |
| 1972 | Fellow of the Institution of Radio and Electronics Engineers, Australia (FIREE) |
| 1972 | Member of the International Astronomical Union |
| 1974 - 1980 | Associate Professor of Electrical Engineering at the University of Sydney |
| 1978 | Fellow of the Institute of Engineers, Australia (FIE Aust) |
| 1979 - | Member of the International Astronomical Union |
| 1980 | Norman W.V. Hayes Medal received from the Institution of Radio and Electronics Engineers |
| 1980 | Chief Designate of the CSIRO (Commonwealth Scientific and Industrial Research Organisation) Division of Radiophysics |
| 1980 | Professor Director of Fleurs Observatory (University of Sydney) |
| 1980 - 1986 | Chairman of the National Committee for Radio Sciences of the Australian Academy of Science (Member 1976 -1980) |
| 1981 - 1988 | Chief of the CSIRO Division of Radiophysics |
| 1982 - | Fellow of the Australian Academy of Technological Sciences and Engineering (FTSE) |
| 1982 | Doctor of Science in Engineering (DScEng) received from the University of Sydney |
| 1982 - 1988 | Director of the Australian Telescope Project and Chair of the Australian Telescope Advisory Committee |
| 1983 | Pawsey Lecturer for the Australian Institute of Physics |
| 1984 - | Member of the Australian Optical Society |
| 1984 | Centennial Medal for Radioastronomy and Electroacoustics received from the Institute of Electrical and Electronic Engineers |
| 1984 | Senior member of the Institute of Electrical and Electronic Engineers Inc. USA |
| 1984 - 1987 | Vice-Chairman of Commission J of the International Union of Radio Science |
| 1985 | Member of the COSPAR (Committee On Space Research) ad hoc Committee of Space VLBI (Very Long Baseline Interferometry) |
| 1985 - 1988 | Member of the Very Long Baseline Array Advisory Committee of the National Radio Astronomy Observatory in Charlottesville, USA |
| 1986 - 1989 | Chair of the Australian Telecommunications and Electronics Research Board / Radio Research Board (Member from 1981, Deputy Chairman from 1984) |
| 1987 - | Member of the National Committee for Astronomy for the Australian Academy of Science |
| 1987 - 1990 | Chairman of Commission J of the International Union of Radio Science |
| 1988 | Fellow of the Astronomical Society of Australia (FASA) |
| 1988 | Director of Ausonics Pty. Ltd. |
| 1988 - 1989 | Director of Siromath Pty Ltd |
| 1988 - 1996 | Director of the CSIRO Institute of Information Science and Engineering |
| 1989 - | Member of the Australia Telescope Steering Committee |
| 1989 - 1990 | Director of The Preston Group Pty. Ltd. |
| 1989 - 1991 | Director of Triune Pty. Ltd. |
| 1989 - 1993 | Chairman of the Anglo-Australian Telescope Board (Member since 1981) |
| 1991 - 1992 | Director of the Australian Computing and Communications Institute |
| 1991 - 1993 | Director of the Technology Development Corporation Board of South Australia |
| 1992 - | Fellow of the Australian Academy of Science (FAA) |
| 1993 - 1995 | Chairman of IR&D Board Information, Communications & Electronics Committee (Member from 1991-1993) |
| 1995 | Member of the Review Committee for CSIRO |
| 1995 - 1997 | Director of AWA Ltd. |
| 1996 | Officer of the Order of Australia (AO) |
| 1996 - 1997 | Vice President of the Australian Academy of Science (Member of Council from 1995-1997) |
| 1997 - 1999 | Deputy Chief Executive of CSIRO |
| 1998 - 1999 | Director of XRT Pty Ltd |
| 1999 - | Vice-President for Innovation at ResMed Ltd. |
| 1999 | Doctor of Science honoris causa (Hon DSc) received from Macquarie University in New South Wales |
| 1999 - 2000 | Special Adviser to the Chief Executive of CSIRO |
| 1999 - 2004 | Member of Council at Royal Melbourne Institute of Technology |
| 1999 - 2004 | Adjunct Professor of Electronics at Macquarie University |
| 2000 - | Chief Technology Officer at Innovation Capital Associates Pty. Ltd. |
| 2000 - | Chair of the Australian Square Kilometre Array Consortium |
| 2001 - 2004 | Member of the Australian Astronomy Board of Management |
| 2001 - 2004 | Board member of RMIT International University in Vietnam |
| 2002 - | Council member of the Australian Academy of Science |
| 2002 - | Director of Neuromonics Limited |
| 2003 - | Board member of the Australian Business Foundation |
| 2004 - | Vice President and Secretary of Physical Sciences at the Australian Academy of Science |
| 2005 - | Member of the CRC (Cooperative Research Centre) Committee of the Commonwealth Department of Education, Science and Training |
