John spent most of his career at the Department of Health and then NHS England, which he helped establish. In previous roles he was responsible for quality regulation, Foundation Trust policy, major capital investment, the comprehensive spending review, and for two years he was Private Secretary to the Secretary of State for Health.

John was appointed Director of Strategy and Integration in August 2016 to lead on developing and integrating services which deliver new models of care in the Bradford district and across West Yorkshire. As Deputy Chief Executive he also leads on corporate governance and communications.