Gill graduated from Cambridge and trained in Renal and General Medicine in London. She completed a PhD funded by the Medical Research Council and established clinical research in the mechanisms, diagnosis and treatment of systemic vasculitis.

Between 1995 and 2010 she held consultant-level posts at Imperial College, Hammersmith Hospitals and Imperial College Healthcare Trusts, with additional responsibilities as Director of Postgraduate Medical Education and Professional Development, Clinical Director and latterly Director for the Medicine Clinical Programme Group. She was Renal Training Programme Director for North London for four years and has also been a member of the London Workforce Advisory Forum.

She moved to UCLH NHS Foundation Trust in January 2010, to become Medical Director of the Specialist Hospitals Clinical Board, leading clinical services at the National Hospital for Neurology and Neurosurgery, the Heart Hospital, the Eastman Dental Hospital, the Royal National Nose, Throat and Ear Hospital and in Women’s Health and Paediatrics.

Gill is a member of the NHS Top Leaders Programme.