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I specialise in impact evaluations of Global Development and Health programmes using randomised, quasi-experimental and mixed-methods designs, systematic review and meta-analysis. At LSHTM I work with the Pathfinder project (climate and health co-benefits), the Environmental Health Group, and the Action Against Stunting Hub. I work closely with global partners in evidence synthesis including Campbell South Asia, Cochrane and am elected Co-Chair of the Campbell Collaboration Climate Solutions Coordinating Group. I am also a Methods Editor with Campbell Systematic Reviews and the Journal of Development Effectiveness. Previously, I founded the Systematic Reviews Programme and London Office of the International Initiative for Impact Evaluation (3ie), based at London International Development Centre, where I worked for 10 years, and was later seconded to the 3ie Evaluation Office based in New Delhi. I have worked for extended periods at the Ministry of Finance and Economic Planning in the Government of Rwanda in Kigali, the World Bank's Independent Evaluation Group in Washington, DC, the UK National Audit Office and the Poverty Research Unit at Sussex University. I have conducted assignments for the Asian Development Bank, Dasra Foundation, DFAT, DFID, FCDO, the Economist Intelligence Unit, Global Affairs Canada, the International Finance Corporation, the Netherlands Ministry of Foreign Affairs, Save the Children, Sightsavers, USAID and the World Health Organization among others. I hold a PhD in Impact Evaluation of Infectious Diseases and Public Health from LSHTM, where I studied under Professor Sandy Cairncross and Edoardo Masset, MA Development Economics from the University of Sussex, and BSc Economics from the University of York.