Marian Knight is Professor of Maternal and Child Population Health at the National Perinatal Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, UK. She is a public health physician and applied health researcher whose research focuses on the care and prevention of severe complications of pregnancy and early life and addressing disparities in outcomes for women and babies from different population groups. She established the UK Obstetric Surveillance System (UKOSS) in 2005 to conduct national studies of severe morbidities in pregnancy and leads the MBRRACE-UK national Confidential Enquiries into Maternal Deaths and Morbidity. She leads a parallel stream of work to improve the care of babies who undergo surgery in early life. She was elected to fellowship of the Academy of Medical Sciences in 2021 in recognition of her exceptional contribution to the advancement of medical science, and awarded an MBE in the 2023 King’s New Year Honours for services to maternal and Public Health.