Leon’s research activities have focused on the major health issues of older people, including falls, depression and cognitive impairment. He has performed and reported many studies about frailty and successful ageing. To date, Leon has published 15 book chapters and 475 peer-reviewed articles. He has served on numerous government committees and professional organizations. He has been Chair of Asia Pacific Geriatric Medicine Network for the last 15 years. He was honored to receive an Officer of the Order of Australia for his contributions to geriatric medicine and dementia prevention and care.