Dr Jonathan Williamson is a respiratory and sleep physician who trained in Sydney, interstate and overseas in Heidelberg, Germany. He is a Consultant Respiratory and Sleep Physician at Liverpool Hospital and at Macquarie University Hospital. He consults in rooms at Macquarie University Clinic. Dr Williamson's practice covers a wide range of respiratory and sleep pathologies including asthma, COPD, lung and airway infections, emphysema, sleep disorders and lung cancer with a sub specialised interest in airway interventions including rigid bronchoscopy, cryotherapy, endoscopic valves, airway stents and managing central airway obstruction. After completing training in NSW Dr Williamson undertook PhD studies at the University of Western Australia investigating new ways to image the lungs. Dr Williamson directs the interventional bronchoscopy unit at Liverpool