Mr Johan van Zyl is a Senior Research Specialist in the Social Aspects of Public Health research programme of the HSRC. He has BA (Hons) degrees in geography from the University of Pretoria. Before joining the HSRC, Mr van Zyl was employed by the Bureau for Market Research at the University of South Africa, and served in an advisory capacity for a number of local and international organisations. His areas of research expertise include analytical demography, population projections, estimation of fertility and mortality rates from survey data, applied demography, field surveys, questionnaire design, sample specifications, and knowledge of the principles of data analysis.
He has particular interest in the conduct of large population based surveys. For instance at the HSRC he worked on teams conducting the fertility and demographic and health surveys in the 1980?s and 1990?s at the HSRC. More recently, he was involved from the start in the series of SABSSM surveys that investigated the prevalence of HIV in South Africa. Mr van Zyl has delivered papers at national and international conferences, and written or edited several books, chapters and client reports in areas related to demography as well as other survey-based studies.