Dr Michael Mullen is a consultant cardiologist based in London. He is recognised, internationally, for his expertise in the treatment of structural heart disease, with 20 years of experience in this field. His private practice is based at the Harley Street Clinic and Barts Heart Centre, where he is the clinical lead for structural heart intervention. His areas of clinical expertise include percutaneous aortic valve replacement, MitraClip repair of mitral regurgitation, device closure of patent foramen ovale (PFO) and atrial septal defect (ASD) and other bespoke interventions for structural heart abnormalities. He has played a key role in the development of many new technologies for the treatment of these conditions and their introduction into clinical practice in the UK, including TAVI, MitraClip and suture closure of patent foramen ovale. Dr Mullen has a broad research portfolio and is frequently invited to give lectures and live demonstrations at national and international conferences.