The editors of the SACEMA quarterly

The editors

Alex Welte

Since 1 July 2010 Alex Welte was the Director of SACEMA from July 2010 to June 2016 and he is currently a staff researcher at SACEMA.

After receiving his PhD in Physics at the University of Pennsylvania (1998), Dr Alex Welte completed a Postdoctoral Fellowship in the Pennsylvania Physics Department focusing on developing database systems for social and medical data. He then returned to South Africa to be involved in a major epidemiological and demographic study in rural KwaZulu Natal with the Africa Centre at the University of KwaZulu Natal. The study focused on the HIV epidemic in the region. After that he started lecturing at Wits and during that time was involved in various SACEMA projects as Senior Scientific Advisor, including supervising several SACEMA students.

Alex’s research interests lie in the areas of population dynamics, quantum mechanics and computational methods.

Brian Williams

Brian Williams is an epidemiologist affiliated to SACEMA. He studied physics at the University of Natal and then in Cambridge. He has published papers in many areas of science: physics, chemistry, statistics, epidemiology, entomology, ecology, anthropology, social sciences and public health. He taught physics in Dar es Salaam, did research on electron microscopy in Helsinki and Cambridge, controlled tsetse flies in Kenya, worked on malaria and leishmaniasis in London, on silicosis, HIV and TB among mineworkers in Johannesburg, and then joined the World Health Organisation to work on TB. Most recently he has been thinking about HIV and TB with a particular interest in using dynamical models to understand time trends in the epidemics of both diseases, to explore different ways in which to control HIV and TB, to make future projections under different scenarios, to provide advice to policy makers at a national and an international level while taking cognisance of the social determinants of disease and the importance of dealing with the issues that they raise. The unifying theme in his scientific life has been the application of mathematics and statistics to modelling and understanding dynamical systems.


Wim Delva

Wim Delva trained as a medical doctor and obtained a PhD degree at Ghent University in Belgium. In 2008 he moved to Cape Town, and since June 2012 he is deputy-director for research at SACEMA.

Wim also has a part-time research appointment at Ghent University’s International Centre for Reproductive Health. His research involves the application of statistical, epidemiological and mathematical modelling techniques to describe and analyse the behavioural and biological processes underlying generalised HIV epidemics in sub-Saharan Africa, and his current research centres around the role of age-mixing patterns and other features of sexual networks in HIV transmission dynamics, the use of individual-based models as a data-generating tool for benchmarking the performance of other modelling frameworks, and methods for calibrating individual-based models to summarised data.

Wim is the chair of the editorial board of the SACEMA Quarterly.


Annette Gerritsen

Annette Gerritsen was professionally trained in epidemiology in The Netherlands. She obtained her PhD from the Vrije Universiteit in Amsterdam, reporting on a randomized controlled clinical trial on the treatment of carpal tunnel syndrome. After that she has been involved in research studies focusing on the health and health care use of refugees, asylum seekers and other migrants in the Netherlands. In 2007 she moved to South Africa to work as a senior lecturer in epidemiology and biostatistics at the University of Venda, Thohoyandou, where she coordinated the Master of Public Health program. In 2008 she founded Epi Result, a company specializing in design, analysis and reporting of epidemiological studies. Her research areas of interest include: infectious diseases (HIV, TB, malaria, diarrhoea), migration and health, with her main interest being the research methodology.

Annette is the managing editor of the SACEMA Quarterly.