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?




Gregson S, Skovdal M, Sorensen O, et al., 2022, “It will not be easy to accept”: Parents conflicting attitudes towards pre-exposure prophylaxis for HIV prevention amongst adolescent girls and young women in Zimbabwe, Research in Social and Administrative Pharmacy, ISSN:1551-7411

Rao A, Moorhouse L, Maswera R, et al., 2022, Status of the HIV epidemic in Manicaland, east Zimbabwe prior to the outbreak of the COVID-19 pandemic, Plos One, Vol:17, ISSN:1932-6203, Pages:1-19

Skovdal M, Clausen CL, Magoge-Mandizvidza P, et al., 2022, How gender norms and 'good girl' notions prevent adolescent girls and young women from engaging with PrEP: qualitative insights from Zimbabwe, Bmc Womens Health, Vol:22, ISSN:1472-6874

Beckmann N, Skovdal M, Maswera R, et al., 2022, Rituals of care: Strategies adopted by HIV testers to avoid misdiagnosis in rapid HIV testing in Zimbabwe, Global Public Health, ISSN:1744-1692, Pages:1-14


Davis K, Pickles M, Gregson S, et al., 2022, The effect of universal testing and treatment for HIV on health-related quality of life - data from the HPTN 071 (PopART) cluster randomised trial in Zambia and South Africa, AIDS 2022, International AIDS Society, ISSN:1758-2652

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