Sir Charles Gairdner Hospital and School of Medicine and Pharmacology, University of Western Australia John P Walsh MBBS, FRACP, PhD is a Consultant Endocrinologist at Sir Charles Gairdner Hospital, Perth and a Clinical Professor in the School of Medicine and Pharmacology, University of Western Australia. He has published extensively on the epidemiology and management of thyroid disease, including clinical trials of thyroid hormone replacement regimens, cardiovascular effects of thyroid dysfunction and genetic influences on pituitary-thyroid axis function. He also has a research interest in the molecular genetics and management of Paget’s disease of bone.