She has worked predominantly on large-scale prospective studies such as EPIC and the Million Women Study and has a keen research interest in the role of diet, hormones and circulating biomarkers in cancer development. She is co-Principal Investigator of the Endogenous Hormones, Nutritional Biomarkers and Prostate Cancer Collaborative Group, which aims to conduct individual pooled analyses of the relationship between circulating biomarkers and prostate cancer risk from cohort studies from around the world. In 2011, she became Senior Epidemiologist for UK Biobank and helps co-ordinate record linkage of routine health-related datasets into the study.