Dr. Costello is a pulmonologist, who, for 25 years, was head of Respiratory Medicine at King's College Hospital in London. He also served as clinical director of medicine and its trust's first medical director. To ensure his patients receive the most effective and advanced treatments possible, Dr. Costello has conducted research on a broad spectrum of respiratory disorders, and has a clinical commitment to the management of COVID-19 infection in the acute phase and its longer term effects.