Bryan Grenfell is Kathryn Briger and Sarah Fenton Professor of Ecology and Public Affairs, and Director of the Health Grand Challenge Initiative. He is interested in the interface between theoretical models and empirical data in population biology. Grenfell is a population biologist (jointly appointed in EEB and WWS). He focuses in particular on the dynamics and control of infectious diseases in space and time. He combines the development of theory with analyses of empirical data sets from a range of diseases, including measles, rotavirus and influenza. Originally trained as a zoologist, Grenfell has worked on the dynamics of epidemics since 1980. He is a Fellow of the Royal Society of London and a fellow of the American Academy of Arts and Sciences and the American Association for the Advancement of Science.