| 1/2012 - 12/2021 | Professor, Department of Computer Science, School of Computing, University of South Africa (Unisa) |
| 1/2001 - 12/2011 | Associate Professor, School of Computer Science, University of the Witwatersrand, Johannesburg (Wits) |
| 1/1998 - 12/2000 | Principal Tutor on the Special List, Department of Computer Science, University
of the Witwatersrand, Johannesburg |
| 1/1996 - 12/1997 | Principal Tutor, Department of Computer Science, University of the Witwatersrand, Johannesburg |
| 1/1995 - 12/1995 | Senior Tutor on the Senior Lecturer Salary Scale, Department of Computer Science,
University of the Witwatersrand, Johannesburg |
| 1/1990 - 12/1994 | Senior Tutor, Department of Computer Science, University of the Witwatersrand, Johannesburg |
| 2/1987 - 6/1987 | Major-time Senior Tutor, Department of Computer Science, University of the Witwatersrand, Johannesburg |