Ioannis has worked in the areas of pulmonary rehabilitation and cardiopulmonary exercise testing for over 30 years. For 3 years he was the Chair of the Rehabilitation and Chronic Care group of the European Respiratory Society (ERS) and he is currently the ERS Head of Assembly 1 (Respiratory, Clinical Care & Physiology). He has contributed to several joint ERS and American Thoracic Society (ATS) Statements on pulmonary rehabilitation, skeletal muscle dysfunction, cardiopulmonary exercise testing, respiratory muscle function assessment and physical inactivity in patients with COPD. He has co-chaired an ATS/ERS joint policy statement for enhancing implementation, use and delivery of pulmonary rehabilitation globally.  He was a member of the Development Group for COPD for the WHO Rehabilitation Programme. He is currently a National Institute for Health and Care Excellence (NICE) expert advisory panel member for managing the long-term effects of COVID-19. His research focuses on exercise intolerance in chronic lung disorders, and on the benefits of interval exercise training in COPD.  Ioannis is an Hororary Research Fellow at Newcastle Hospitals NHS Foundation Trust.