Saidi Kapiga is a Reader in Epidemiology and International Health at the London School of Hygiene and Tropical Medicine (LSHTM). He is also the current Scientific Director of the Mwanza Intervention Trials Unit (MITU) and is based full time in Mwanza, Tanzania. This is a semi-autonomous Unit established by the LSHTM in partnership with the Tanzanian National Institute for Medical Research (NIMR). MITU has carried out a series of research studies on the epidemiology and control of HIV and other sexual health problems, with a particular focus on randomised controlled trials of preventive interventions, and has developed special expertise in the use of cluster randomised trials to measure the population-level effects of health interventions. For more than 20 years, Kapiga has conducted research focusing on the investigation of the biological and social factors associated with increased risk of HIV/AIDS and other sexually transmitted infections (STIs). He has a particular interest in randomised controlled trials (RCTs) of interventions against HIV and other STIs among vulnerable populations, including trials to assess the impact of STI control as a strategy for prevention of HIV and cervical cancer; the efficacy of candidate microbicide products among women; strategies to improve health system response against chronic diseases including HIV; and the role of alcohol focused interventions as a strategy for HIV prevention. Kapiga is currently the Co-Principal Investigator of a study to determine the burden of chronic diseases at the population and the health services levels in Tanzania and Uganda, and a cluster RCT to assess the impact of micro-finance and participatory gender training on physical and/or sexual intimate partner violence and empowerment in North Western Tanzania. He is also a protocol co-chair of a Phase III RCT to determine the efficacy of Dapivirine vaginal microbicide matrix ring for prevention of HIV among women in South Africa and Uganda (IPM 027). Kapiga received his medical training at the University of Dar es Salaam (1981-1986). Later he received his Master of Public Health (1989) and Doctor of Science (1998) degrees from Harvard University, MA, USA.