Professor John Pearn is a clinician and medical historian based in Brisbane, Australia. He has been an Academic and Clinical Teacher for 50 years in Medicine and Health Sciences, based at the University of Queensland. He is the Author of some thirty books and more than 200 published papers on the history of medicine and health. As Major General John Pearn, he served in the Defence Reserves for 35 years, ultimately in the appointment of Surgeon General of the Australian Defence Force. He commanded the 2 Field Hospital, formerly No. 1 Casualty Clearing Station which was the pivot medical unit on the beach at Gallipoli, 25 April 1915. Professor John Pearn was a founder, later President and then Honorary Life Member of the Australian and New Zealand Society of the History of Medicine. He is an historian of the Order of St John. He has been a Member of the Council for the International Society of the History of Medicine for many years; and its Vice President for the last four years. His books include the history of one of the Greek Islands and research publications on Simpson (of Gallipoli fame) and on ancient Greek medicine.