I serve as the Director of the Environmental Health Group which is the focus of the School's work on water, sanitation and hygiene (WASH) and health and currently includes approximately 30 researchers and support staff working on range of different areas of research. I am the Principal Investigator for a number of studies in different countries, including Mozambique, Kenya, Senegal and the Democratic Republic of Congo (DRC). I also serve as the Research Director of the SHARE Research Programme Consortium - an ten-year, multi-country, research partnership to deliver research and capacity to strengthen sanitation policy and programmes in low and middle income countries. I have worked in various regions of the world, collaborating with a range of research and implementing organisations, and providing policy advice to different governments and multilateral agencies. 

My research focuses on the epidemiology of water, sanitation and hygiene related diseases. I am currently working on a number of trials to evaluate the effects of these interventions on different child health outcomes, including enteric infections, child growth and development, and oral vaccine performance. My main projects include:

The MapSan Study in Maputo, Mozambique, which is supported by the Bill and Melinda Gates Foundation, and in collaboration with the Instituto Nacional de Saúde - Centro de Investigação e Treino em Saúde da Polana Caniço (INS-CISPOC), in Mozambique, and the University of North Carolina in the US. This study aims to evaluate the impact of sanitation on various health outcomes among children living in dense urban areas.

The SaniVac trial  in Maputo, Mozambique, which is supported by the Centers for Disease Control Foundation, and in collaboration with INS-CISPOC in Mozambique, and the Centers of Disease Control (CDC) and the Georgia Insititute of Technology in the US. This is a controlled cohort study to assess the effect of sanitation and concurrent enteric infection on oral rotavirus immunogenicity. 

The Safe Start trial in Kisumu, Kenya, which is supported by the UK Department for International Development, and in collaboration with Great Lakes University Kisumu, in Kenya, and the University of Iowa, in the US. This is a cluster-randomised controlled trial for the effect of an infant food hygiene intervention on enteric infections. 

The Uvira trial  in Uvira, DRC, which is supported by the French Development Agency (AFD) and the Veolia Foundation. This is a randomised stepped wedge evaluation of the effect of improved water supply on cholera incidence.

The Urban Infant Foodscape project in Maputo, Mozambique, and Nairobi, Kenya, which is supported by the Bill and Melinda Gates Foundation and the UK Department for International Development, in collaboration with INS-CISPOC in Mozambique and the International Lifestock Research Institute in Kenya. This is a multi-country study to identify food system-related risks for enteric infections in young children in low-income urban areas.