Professor Lewis is Professor of Oral Medicine and Dean of the School of Dentistry at Cardiff University. He is also Clinical Board Director for Dentistry, Cardiff & Vale University Health Board. He is also a past Dean of the Dental Faculty of the Royal College of Physicians & Surgeons of Glasgow.
Professor Lewis has published over 200 scientific articles and co-authored six medical textbooks. He has delivered more than 500 postgraduate lectures worldwide. In addition, he has served as President of the British Society for Oral Medicine and President of the British Society for Oral & Dental Research.