Positions held: Emeritus Professor and Senior Honorary Research Fellow from 1 July 2015
1980- Professor of Physics, Physics Department, University of Western Australia
1980-83, 83-86, 87-90 Head of the Physics Department, UWA; Winthrop Professor 2008-
1992 Dean, Faculty of Science, UWA; 1993 Head of Division of Agriculture and Science, UWA

1978-79: Senior Fellow, Science Research Council, UK
1970-80 Lect (1970), Snr Lect (1973), Reader (1976), Dept Physics, Queens University, Belfast, UK
1967-1970: Research Scientist, General Atomic, San Diego, Calif, USA.
1965-1967: NRC Fellow, Laval University, Quebec, Canada.
1965 -1965 Research Scientist, AAERC, Lucas Heights, NSW.
1960-1964 Senior Demonstrator, Physics Department, Australian National University

Service
1984- 2015 Member, International Editorial Advisory Board, Journal of Physics B: At. Mol. Opt. Phys.
2000- Editor, Atomic Physics, Central European J Phys; 2014- Editor, Atomic Physics, Cogent Physics.
2001- 2005 Member, National Scientific Advisory Committee, Australian Synchrotron.
2006-10 Member, National Endeavour Research Fellowship and Scholarships Selection Panel, DEST
1998- Member, Australian Academy of Science Committees [e.g. Chair Section 2 (Physics and Astronomy 2002-5), Selby Fellowship 2010/14, International Travel Grants]
2001- 2014 Member, UWA Senate Honorary Degrees Committee; External Examiner Uni. Malaya (1992-4)
1977-80 UK Science Research Council Physics Committee, and subcommittee on At Mol Plasma Physics.
1984-92 Member of IUPAP, Commission 15 on Atomic, Molecular and Optical Physics and Spectroscopy.
1995-97 Member, International Conference Advisory Committees: ICPEAC and (e,2e) satellite; 2002-16 MPS