Dennis obtained his degree in Medicine (MB BCh) in Cardiff, UK, in 1998 and was awarded Doctor of Medicine (MD) for his research on the impact of respiratory viruses in Cystic Fibrosis from the University of Cardiff. He trained in pulmonary medicine in Cambridge. During this period, he had the opportunity to work in the Cystic Fibrosis Unit at Papworth, UK. In 2009, he was appointed as Consultant Respiratory Physician in the Cambridge Centre for Lung Infection at Papworth Hospital, dedicated to looking after patients with Cystic Fibrosis and non-CF bronchiectasis. In 2012, Dennis moved to Liverpool for family reasons and joined the Knowsley Community COPD Service. Under his stewardship, this service has since won the Health Service Journal ‘Respiratory Integrated Care Award’ in 2013. Apart from his vast experience practising CT and COPD, he also has experience in asthma, non-CF bronchiectasis, sleep medicine and oxygen therapy for the management of chronic lung diseases. Dennis has published widely in respiratory medicine, including peer-reviewed journals, abstracts and book chapters. He has also been a reviewer for a number of high-impact peer-reviewed journals.