Jonathan Sterne, Professor of Medical Statistics and Epidemiology at the University of Bristol, is an internationally renowned epidemiologist who develops and applies epidemiological and statistical methods to deliver advances in health care and public health. He has led the ART Cohort Collaboration of 21 HIV cohort studies from North America and Europe which has made paradigm-shifting contributions to understanding the prognosis and treatment of people living with HIV and been hugely influential in changing British, European, US and international treatment guidelines. His contributions to statistical methodology include a leading textbook on medical statistics and work on causal inference and methods for missing data.