Alan Maryon-Davis (born January 1943), is a doctor, writer/broadcaster and member of the humorous cabaret group Instant Sunshine.
He was born in Chiswick, West London, and was educated at St Paul's School, London, St John's College, Cambridge and St Thomas's Hospital Medical School, King's College London.
Following an early career in hospital medicine and general practice, he transferred to the field of public health with a focus on health promotion and prevention. He was Head of Health Sciences at the Health Education Council (a national non-government organization based in London) and a member of various UK Department of Health committees and task-forces on nutrition, physical activity, cancer prevention, accident prevention, and health partnerships. In the mid-1980s he founded the National Forum for Coronary Heart Disease Prevention (now the National Heart Forum) and the Welsh heart disease prevention programme Heart Beat Wales.
In 1988, he switched to working at local level as a public health specialist in inner south London, most recently as Director of Public Health for Southwark (2002–07). He is the former President of the UK Faculty of Public Health, Chair of the Royal Society for Public Health, Vice-Chair of the National Heart Forum, Councillor of the Royal College of Physicians, foundation fellow of the UK Faculty of Sports and Exercise Medicine, and an honorary professor in public health at King's College London.