Gyles leads the learning disabilities observatory team within Public Health England. He works with partners in Lancaster University Centre for Disabilities Research and a third sector organisation, the National Development Team for Inclusion to monitoring information about the health of people with learning disabilities and the health and social care they get.
He trained in medicine at St Bartholomew’s hospital and at University College London, in psychiatry at the Royal London Hospital and in public health in north London and at the London School of Hygiene and Tropical Medicine. He has worked in academic posts in London and Durham and at the research unit of the Royal College of Psychiatrists. From 1993 to 2002 he worked at the Department of Health developing the Mental Health Minimum Dataset. In 2006 he moved to the North East Public Health Observatory, coming into Public Health England when it was set up.