Catherine Williamson is Professor of Women’s Health at Imperial College London. She is Consultant in Obstetric Medicine at Queen Charlotte’s, St Thomas’ and King’s College Hospitals. She is a Fellow of the Academy of Medical Sciences. Her research focuses on the maternal and fetal aetiology, outcomes and management of intrahepatic cholestasis of pregnancy, gestational diabetes mellitus and severe hyperemesis gravidarum. Her cholestasis work has resulted in implementation of genetic screening for biliary transporter mutations by the NHS Genomic Medicine Service, and she is now evaluating the impact of identified mutations on maternal future health.