Chris Dye trained as a biologist and ecologist (BA York) but postgraduate research on mosquitoes (DPhil Oxford) led to epidemiology and public health. Based at Imperial College and the London School of Hygiene and Tropical Medicine from 1982-96, he did research on bloodsucking insects as vectors of leishmaniasis, malaria and river blindness in Africa, Asia and South America, and on the role of domestic and wild animals as reservoirs of human infection and disease. Joining the World Health Organization in 1996 he developed ways of analyzing the vast quantities of routine surveillance data collected by government health departments worldwide ─ to better understand and control tuberculosis, malaria, and Ebola, HIV, SARS and Zika viruses. As WHO Director of Strategy 2014-18, he served as science advisor to the Director General, oversaw the production and dissemination of health information by WHO press and libraries, and coordinated WHO’s work on health and the Sustainable Development Goals. He is now Emeritus Professor of Epidemiology at Oxford University, a Fellow of The UK Royal Society, and of the UK Academy of Medical Sciences. His most recent book is Investing in Health and Wellbeing: When Prevention is Better than Cure (OUP 2024).