Dr Keeble trained in Cardiology within the London Chest Hospital, and performed international fellowships in Australia and Switzerland. He was appointed as a consultant cardiologist (heart expert) in 2014 and is a specialist in heart artery stent implantation both in stable patients with chest pain (angina) and in patients presenting to the Essex cardiothoracic centre with heart attacks (blocked arteries).
He has a strong research interest in heart attack and cardiac arrest medicine, and is a recognized UK and European expert in the field. He is a Senior researcher at the Anglia Ruskin School of medicine and has supervised 7 MD / PhD students in the last 5 years.
He is Chair of the BCIS focus group on Out of hospital cardiac arrest (OHCA), and a founding member of the International Task Force for Cardiac Arrest Recovery (ITCAR), both formed to improve standards of acute care and long term follow up of cardiac arrest survivors and families.