Professor Williams is an obstetric physician at the Institute for Women’s Health, University College London Hospital. He leads a multi-disciplinary team that provides clinical care for pregnant women with medical disorders. Originally trained as a nephrologist, he has particular expertise in kidney disease and hypertension in pregnancy. As an obstetric physician he developed the concept that physiological changes in pregnancy lead to gestational syndromes that in turn unmask a predisposition to disease in later life. His research group investigate the pathophysiology and management of pre-eclampsia, acute fatty liver of pregnancy, paternal genetic and epigenetic factors influencing fetal growth and immune causes of recurrent pregnancy loss. He was chairman of the UK NICE guideline on intrapartum management of medical disorders in pregnancy and is current chairman of the Wellbeing of Women Research Advisory Committee.