Imperial College London


Faculty of MedicineSchool of Public Health

Professor in Demography and Behavioural Science



+44 (0)20 7594 3279s.gregson




LG27Praed StreetSt Mary's Campus





Simon Gregson is a demographer working on the dynamics of spread, impact and control of HIV epidemics in sub-Saharan Africa. His work combines empirical studies including large-scale, longitudinal, population-based and clinical surveys with use of mathematical models. Simon is Director of the Manicaland HIV/STD Prevention Project in Zimbabwe.

Video (below)

Why did HIV decline in Zimbabwe?

The unique, population-based Manicaland study tracks the Zimbabwean HIV epidemic over 19 years. Professor Simon Gregson delivers his inaugural lecture. Recorded at Imperial College London on 08 Jun 2011.

Why did HIV decline in Zimbabwe?




Schaefer R, Gregson S, Benedikt C, Widespread changes in sexual behaviour in eastern and southern Africa: Challenges to achieving global HIV targets? Longitudinal analyses of nationally representative surveys, Journal of the International Aids Society, ISSN:1758-2652

Moorhouse L, Schaefer R, Thomas R, et al., Application of the HIV prevention cascade to identify, develop,and evaluate interventions to improve use of prevention methods:Examples from a study in east Zimbabwe, Journal of the International Aids Society, ISSN:1758-2652

Skovdal M, Ssekubugu R, Nyamukapa C, et al., 2019, The rebellious man: next-of-kin accounts of the death of a male relative on antiretroviral therapy in sub-Saharan Africa, Global Public Health, ISSN:1744-1692, Pages:1-12

Schaefer R, Gregson S, Fearon E, et al., 2019, HIV prevention cascades: A unifying framework to replicate the successes of treatment cascades, The Lancet Hiv, Vol:6, ISSN:2405-4704

Schaefer R, Thomas R, Nyamukapa C, et al., 2018, Accuracy of HIV risk perception in east Zimbabwe 2003-2013, Aids and Behavior, ISSN:1090-7165

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