1993-1995 Lecturer, Department of Statistics
Faculty of Economics & Social Sciences,Omdurman Islamic University, Sudan.
1993-1995 Manager of the Computer & Information Centre
Ministry of Health, Khartoum, Sudan
(Sponsored by Save the Children Fund, SCF-U.K).
1992-1996 Assistant Co-ordinator of the Khartoum Comprehensive Child Care Project (KCCCP) and the Cost Recovery Project (User Fees), SCF-UK
Ministry of Health, Khartoum, Sudan.
2000- 2007 Biostatistician and Senior Research Associate
Desmond Tutu HIV Research Centre
Institute of Infectious Disease and Molecular Medicine (IIDMM)
Department of Medicine, University of Cape Town.
2002-2003 Visiting Postgraduate Researcher
Department of Epidemiology and Biostatistics
McGill University, Montreal, Canada.
2007-2008 Biostatistician and Senior Research Associate
Clinical Research Support Centre (CRSC)
Royal Victoria Hospital, Belfast, UK
2008- 2010 Senior lecturer (Biostatistician)& Director of the Clinical Research Support Unit, Department of Medicine, University of Cape Town, South Africa.
2010- Associate Professor, Biostatistics, Department of Basic Sciences, College of Medicine, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
2011- Honorary Professor of Biostatistics & Senior Research Associate, Department of Medicine, University of Cape Town, South Africa.
2014-2015 Professor, Biostatistics, Department of Basic Sciences, College of Sciences & Health Provisions, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
2016- Professor, Department of Epidemiology & Biostatistics, College of Public Health & Health Informatics, King Saud Bin Abdulaziz University for Health Sciences, NGHA, Riyadh, Saudi Arabia