Public Health England (PHE) was an executive agency of the Department of Health and Social Care in England which began operating on 1 April 2013 to protect and improve health and wellbeing and reduce health inequalities. Its formation came as a result of the reorganisation of the National Health Service (NHS) in England outlined in the Health and Social Care Act 2012. It took on the role of the Health Protection Agency, the National Treatment Agency for Substance Misuse and a number of other health bodies. It was an executive agency of the Department of Health and Social Care, and a distinct delivery organisation with operational autonomy.