Sir John Armstrong Muir Gray CBE FRCPSGlas FCLIP is a British physician, who has held senior positions in screening, public health, information management.

He was the Chief Knowledge Officer for EXI, a digital health therapeutic company prescribing exercise to people with or at risk of up to 23 long-term health conditions, and is Chief Wellbeing Officer for Learning with Experts, a health related online learning company working with the NHS.

He was director of Research and Development for Anglia and Oxford Regional Health Authority and supported the United Kingdom Centre of the Cochrane Collaboration in promoting evidence-based medicine.

[2] He was knighted in 2005 for the development of the foetal, maternal and child screening programme and the creation of the National Library for Health.

[6] This United Kingdom biographical article related to medicine is a stub.