Dr Oyekoya (Koya) Ayonrinde is a Clinician Researcher.  He is a practicing Gastroenterologist and Hepatologist at Fiona Stanley Hospital, Clinical Associate Professor and Research Fellow at The University of Western Australia, and Adjunct Clinical Professor at Curtin University.

He graduated from The University of Western Australia and obtained a Fellowship of The Royal Australasian College of Physicians. He subsequently gained a PhD from The University of Western Australia, with a PhD thesis (Dean’s list) titled “The epidemiology and significance of non-alcoholic fatty liver disease in adolescents”. The invaluable experience from his PhD, using the resources of the Western Australian Pregnancy Cohort Study (Raine Study), has informed his keen interest in the developmental and childhood origins of health and disease. Armed with the knowledge that many adult-diagnosed disorders have origins during childhood and adolescence, he has continued research related to liver, gastrointestinal and cardiometabolic disorders across the life course, from foetal life to old age. 

He is recognised for his contributions to the epidemiology, phenotype and developmental origins of non-alcoholic fatty liver disease in adolescents, from parent pre-pregnancy characteristics, maternal health and lifestyle during pregnancy, through birth, childhood and adolescence nutrition, lifestyle and cardio-metabolic factors. He recently compared the historical epidemiology and phenotype of fatty liver from the 1800s to contemporary knowledge. He is also actively involved in describing the epidemiology, liver and cardiometabolic significance of fatty liver in adults. 

Dr Ayonrinde is an investigator and co-leader of the cardio-metabolic and liver special interest group of the Raine Study (rainestudy.org.au), which is one of the longest-running, successful longitudinal cohort studies in the world. His clinical and research interests include clinical quality improvement, epidemiological studies and clinical trials related to fatty liver, liver fibrosis and cirrhosis, colorectal polyps, and functional abdominal pain disorders. 

He is the Fiona Stanley Hospital site principal investigator for several nonalcoholic steatohepatitis (NASH) clinical trials.

He is a Member of the Gastroenterology Society of Australia (GESA), Fellow of the American Association for the Study of Liver Disease (AASLD), Member of the European Association for the Study of the Liver (EASL), Member of the American Association for Gastrointestinal Endoscopy (ASGE), and Member of the Developmental Origins of Health and Disease (DOHaD) Society.

He is a supervisor of undergraduate and postgraduate students, and his collaborations span various clinical and non-clinical fields, including gastroenterology and hepatology, clinical and nutritional epidemiology, biostatistics, cardiometabolic medicine, paediatrics and neonatology, psychiatry, psychology, radiology, nursing, obstetrics and gynaecology, physiotherapy, pharmacy and basic sciences.