Marian is a public health physician and Director of the National Perinatal Epidemiology Unit at the University of Oxford where she leads research programmes on maternal and child health and care.
In 2023 she was recognised in the New Year Honours list and appointed Member of the Order of the British Empire (MBE) for services to Maternal and Public Health.
She is also the National Institute of Health and Care Research’s (NIHR) Scientific Director for Research Infrastructure, a Member of the NIHR Board, as well as the Programme Director for the NIHR Programme Grants for Applied Research scheme.