A/Prof Wee Loon Ong is a Radiation Oncologist at the Alfred Health, subspecialising in prostate cancer care. He is the Academic Lead of Prostate Cancer Outcomes Registry Australia and New Zealand (PCOR-ANZ) Monash University School of Public Health and Preventive Medicine, and Adjunct Clinical Associate Professor at Monash University School of Translational Medicine.

He graduated from Monash University School of Medicine (2010), and completed an MPhil in Epidemiology from the University of Cambridge (2013), graduating first in class with the GSK prize. He undertook RANZCR Radiation Oncology specialty training (2016-2021) within the Victorian Training Network, and trained in Peter MacCallum Cancer Centre, Austin Health Olivia Newton-John Cancer Centre, and Ballarat Health. During that time, he concurrently pursued a Doctor of Medicine (MD) research degree through the University of Cambridge as part of the RANZCR Clinician-Scientist Training Pathway. He undertook further radiation oncology fellowship training in prostate cancer at the Alfred Health, Monash University (2021), and the Sunnybrook Odette Cancer Centre, University of Toronto (2022-2023). 

He is actively involved in the Royal Australia and New Zealand College of Radiologists (RANZCR), as a current member of the Radiation Oncology Research Committee (RORC), and ex-officio member of the Radiation Oncology Education and Training Committee (ROETC). During training, he was the Chair of the Radiation Oncology Trainee Committee (ROTC), and was trainee representative on the Faculty Council, and Quality Improvement Committee (QIC). He is the current convenor of the annual RANZCR Trainee SMART (Statistical Methods, Evidence Appraisal, and Research for Trainees) Workshop. He is the current chair of the Trans-Tasman Radiation Oncology Group (TROG) Genitourinary Working Party. He is member of American Society of Clinical Oncology (ASCO), American Society of Radiation Oncology (ASTRO), American Brachytherapy Society (ABS), Australian and New Zealand Urogenital and Prostate Trial Groups (ANZUP).

His research interests are in health services research using population-based administrative dataset and Clinical Quality Registry, as well as the design and conduct of clinical trials. He has published widely, relative to opportunity and stage of career, with more than 60 publications to date, and in high impact journals such as Journal of Clinical Oncology, JAMA Oncology, and European Urology. He has received several competitive grants and research awards, including the Victorian Veski Fellowship, the RANZCR Bourne and Langlands Prize, and the RANZCR Withers and Peters Scholarship, and ASCO Merit Award. He is Associate Editor of the Journal of Medical Imaging and Radiation Oncology (JMIRO), and regular peer reviewer for several other oncology journals.

He is highly-trained in all aspects of radiation therapy for prostate cancer, including stereotactic ablative body radiotherapy (SABR/ SBRT), low dose-rate brachytherapy (LDR-BT), and high dose-rate brachytherapy (HDR-BT). His current clinical practice is based at the Alfred Health Radiation Oncology, Gippsland Radiation Oncology (Latrobe Regional Hospital, Traralgon), and Andrew Love Cancer Centre (Barwon Health, Geelong)