Dr Oh graduated from medical school at University of New South Wales and underwent surgical training at Westmead Hospital.
After receiving his Fellowship from the Royal Australasian College of Surgeons he undertook a year of fellowship in Trauma and Acute Care Surgery at Westmead Hospital, a level 1 trauma centre.
This was followed by two further years of Breast and Endocrine Surgical fellowship at Centre for Breast Health, Royal Brisbane and Women's Hospital and at Concord Repatriation General Hospital.
As well as extensive training and competency in general surgical procedures including hernia and biliary surgery, he has a special interest and experience in treatment of breast cancer and reconstruction and thyroid/parathyroid disorders. Dr Oh works in close liaison with a multidisciplinary team including pathologists, radiation and medical oncologists at Strathfield Private Hospital to ensure a seamless integration of all treatments required for breast cancer.