John graduated from the University College Dublin, Ireland in 1979. He is currently a Consultant Cardiologist (Electrophysiologist) at the Department of Cardiology, Freeman Hospital, Newcastle upon Tyne, UK, Senior Lecture (Clinical), Translational and Clinical Research Institute, Newcastle University.
Over the years John has developed a highly successful dedicated Cardiology-Muscle Clinic at Freeman Hospital providing surveillance and treatment for patients with cardiac involvement related to their inherited neuromuscular disorder, served as a panel member on international DMD Care Considerations guideline formulation project convened by the US Centres for Disease Control and Prevention, Atlanta, USA (2008-09) and contributed to the European and UK Guidelines (2009 & 2020). He was a co-convenor of the 107th ENMC workshop on Cardiac Involvement in Muscular and Myotonic Dystrophy (2002) and the 238th ENMC Workshop Updating management recommendations of cardiac dystrophinopathy (2018). He was chief investigator on the UK, multi-centre, DMD Heart Protection Study (RCT) 2011-’18. He has co-authored the Cochrane Systematic Review: Interventions for preventing and treating cardiac complications in DMD, BMD and X-linked dilated cardiomyopathy (2018, issue 10. doi: 10.1002/14651858.CD009068.pub3).
John is research-active in clinically-based subjects in cardiac electrophysiology / arrhythmia management and cardiac aspects of neuromuscular disorders.
John is currently Scientific Advisor, Sarepta Pharmaceuticals Ltd (2020); Advisor to EspeRare Foundation (2019-’20) and Pfizer Inc. (2020)