Ben Rolfe is a health services and social research specialist with ten years' experience researching health service access and behaviour change. A specialist in Participatory Ethnographic Evaluation Research (PEER) methods, Ben has a particular interest in working with hard-to-reach populations. He has strong track record supporting organisations in conducting participatory research, and to use research evidence for design and decision-making. His work focuses around both behaviour change, and supporting the development of accountable and demand responsive sexual and reproductive health services. He has a wide range of country experience, particularly in South and East Africa, Cambodia, India, and Nepal.