Our Medical Specialists

Prof. Ian Chapman MBBS, PhD, FRACP

Prof. Chapman is an endocrinologist who consults at the Marden surgery. He also consults at Wallaroo and the Royal Adelaide Hospital, where he is a senior specialist. He is a professor at the University of Adelaide where he conducts research on nutrition in older people, and co-chairs the University’s Faculty of Health Sciences Admission Committee.

Prof. Peter Clifton MBBS, B Med Sci, PhD, FRACP

Prof. Clifton is a general physician specialising in endocrinology/dyslipidaemia. He has been Head of the Clinical Research Unit at CSIRO Health Sciences and Nutrition since 1994, and been theme leader for Obesity and Health since 2004. He is now responsible for all food and health related research in both CSIRO Human Nutrition and Food Science Australia. Prof. Clifton has developed strategies to modify cardiovascular risk, and in recent years broadened the focus to the control of obesity and obesity-related conditions, including management of hyperglycaemia and disordered lipids in diabetic and insulin-resistant subjects, and strategies to modify macronutrient intake in order to optimise weight loss in the obese.  Prof. Clifton is responsible for the management of a specialised support team comprising research dietitians, registered nurses and clinical trial managers, which plans and coordinates volunteer studies, conducts pre-launch product testing and efficacy trials, offers consultancy services, provides research advice and literature reviews, and conducts education and information programs. 


Dr. Sunita De Sousa MBBS (Hons), MSc, FRACP

Dr Sunita De Sousa is an endocrinologist with special interests in prolactin excess, pituitary tumours, other endocrine tumours, osteoporosis, thyroid disease and endocrine genetic disorders. She undertook specialist training at the Royal Adelaide Hospital and Queen Elizabeth Hospital and completed fellowships in pituitary endocrinology at St Vincent’s Hospital, Sydney and endocrine genetics at the Women’s and Children’s Hospital. She has a Master of Science from the University of London and she is currently completing her PhD on the topic of prolactinomas at the Royal Adelaide Hospital and SA Pathology. Dr De Sousa also sees patients at the Royal Adelaide Hospital Pituitary Clinic and the South Australian Adult Genetics Unit Endocrine Genetics Clinic


Prof. Robert Fraser MBBS, FRACP, PhD

Professor Fraser is an academic gastroenterologist with major interests in gastrointestinal dysmotility, gut function in older people, and screening and surveillance for colorectal and oesophageal cancer.  For the last 10 years Professor Fraser has provided logistic and management support in the organization of coordinated follow up of colorectal neoplasia in the Southern Adelaide region (SCOOP) and more recently the National Bowel Cancer Screening Program.  From 2002 to 2012 he was Director of the Investigational Procedures Unit and Co-Director of the Swallowing Disorders Unit at the Repatriation General Hospital.  He is currently the Professor of Gastroenterology at Flinders University and Director of Gastroenterology and Hepatology for the Southern Adelaide Local Hospital Network.


Dr. David Jesudason MBBS, FRACP

Dr. David Jesudason is an endocrinologist who consults at our Marden Surgery.  Dr. Jesudason also consults at the Queen Elizabeth Hospital, the Royal Adelaide Hospital, and rurally at Crystal Brook and Port Augusta.  Dr. Jesudason is the Director of Endocrinology and Diabetes at the Queen Elizabeth Hospital and the Director of Endocrinology for Country Health SA.  Dr. Jesudason is a member of the Royal Australasian College of Physicians and the Endocrine Society of Australia.  Dr. Jesudason is involved with the University of Adelaide and is a Clinical Lecturer for the University.  Dr. Jesudason has special interests in diabetes and thyroid disorders, osteoporosis, hyperthyroidism, and pituitary and adrenal disease.



Dr. Wayne Rankin is an endocrinologist with interests in general endocrinology, including adrenal and thyroid disorders, and osteoporosis and other metabolic bone diseases. He undertook basic physician training at Flinders Medical Centre and specialist training at the Royal Adelaide and Queen Elizabeth Hospitals, and continues to consult at the Royal Adelaide Hospital. He also trained in chemical pathology with SA Pathology, where he continues as a consultant chemical pathologist. He holds a PhD from the University of Melbourne, has active research interests in the regulation of glucocorticoid transport in inflammation, and was recently awarded Fellowship of the Faculty of Science of the RCPA for scientific achievement.