Professor Mills is the British Heart Foundation Butler Senior Clinical Research Fellow and a Professor of Cardiology at the University of Edinburgh. He is also a Consultant Interventional Cardiologist at the Royal Infirmary of Edinburgh working for the National Health Service in Scotland. His research aims to understand the mechanisms of myocardial injury in patients with heart disease, and to identify novel approaches to improve risk stratification and clinical outcomes in these patients. He is the chief investigator of a multi-centred cluster randomised trial evaluating the impact of a high sensitive troponin I assay on patients with suspected acute coronary syndrome (High-STEACS). Professor Mills has published more than 200 peer reviewed original articles and is a specialist member of the Diagnostics Advisory Committee for the National Institute of Health and Care Excellence (NICE) consultation on high-sensitivity cardiac troponin.