Dr O'Leary is a Consultant in neurosciences and trauma intensive care medicine at Addenbrooke's Hospital and trained in Bradford, Leeds, Birmingham and at The Alfred Hospital in Melbourne. He is particularly interested in the management of patients with complex traumatic injuries as well as critical care echocardiography, vascular access and the cardiovascular and respiratory complications of brain injuries. He is the education lead for Neurosciences and Trauma Critical Care in Cambridge.