I have worked as an epidemiologist in the WASH sector for over 11 years. I am a medical doctor with an MSc in Infectious Disease Control and a PhD in Epidemiology (on improving survey methodologies to measure the prevalence of diarrhoeal diseases). I am interested in epidemiological methods and study design, sampling methodology and data analysis. I contribute to a wide range of epidemiological studies, randomised trials and programme evaluations, including cluster randomised trials, spatial analysis and post-hoc analysis of routine data. Main conditions of interest are diarrhoeal diseases, worm infections, pneumonia and dengue fever, but I also worked on HIV and non-communicable diseases. A particular focus of my work is the evaluation of sanitation programmes, health promotion campaigns and behaviour change interventions. I have undertaken consultancies for a wide range of national, academic and non-profit organisations.