1998   Visiting Fellow, Psychology, ANU.

1995-1997:  Visiting Fellow, RSBS, ANU

1995-1998:  Visiting Fellow, JCSMR, ANU.

1991-1994:  Executive Director,
     Centre for Visual Science,
     Australian National University.

1986:   Visiting Research Fellow,
     Inst. Nat. de la Saute et de la Recherche Medicale,
     (INSERM 94),
     Lyon, France.

1982 - 1985:  Chairman of Faculty, J.C.S.M.R., A.N.U.
     Faculty representative on Faculty Board,
     John Curtin School of Medical Research,
     Australian National University

1979 - 1980:  Faculty Representative,
     Board of the Institute of Advanced Studies,
     Australian National University

1979 -1981:  Faculty representative, Faculty Board,
      John Curtin School of Medical Research,
     Australian National University

1979-1994:  Senior Fellow, Department of Physiology,
     John Curtin School of Medical Research,
     Australian National University

1975:   International Scholar ,
     Research to Prevent Blindness, Inc.,
     Department of Ophthalmology,
     University of Washington, Seattle, U.S.A.

1972 - 1979:  Fellow, Department of Physiology,
     John Curtin School of Medical Research,
     Australian National University

1968 - 1972:  Research Fellow, Department of Physiology,
     John Curtin School of Medical Research,
     Australian National University

1967:   Visiting Research Fellow,
     Physiological Laboratory,
     University of Cambridge, England

1966 - 1967:  Visiting Research Fellow, Primate Vision,
      Laboratory, Indiana University, Bloomington,
      U.S.A.

1955 - 1967: Chairman of Council
    Victorian College of Optometry
    University of Melbourne

1952 - 1968: Private optometric practice
    Clinician and examiner in Clinical Optometry,
    Optometry Department, University of Melbourne

1950 - 1968:  Part time demonstrator and lecturer,
     Department of Physiology,
     University of Melbourne