Stephen has led the statistics work of the Statistics and Data Science team at the MRC Epidemiology Unit since 2006; he and his team play an integral part in the research of all the scientific programmes in the Epidemiology Unit. This includes taking the lead on some of the major analyses and providing advice to Unit scientists on aspects of study design, analysis, interpretation and reporting of results. Stephen has contributed to many peer-reviewed publications based on research undertaken in the MRC Epidemiology Unit, and has worked with statisticians in the MRC Biostatistics Unit on methodological topics of interest and relevance to both Units. He also provides statistical input into external studies as part of the Cambridge Epidemiology and Trials Unit.