Credentials B Sc (St Andrews), MB ChB (Man), MRCP (UK), M.D. (Edin), CCST (UK), FAMS (Sin), FRCP (Edin)
Language English, Mandarin Chinese, Bahasa Melayu, Bahasa Indonesia, Hokkien Dialect, Cantonese Dialect, Teochew Dialect

Dr Widjaja Luman obtained his bachelor of Science from the university of St Andrews in 1985 and MB ChB from the University of Manchester in 1988.

He did his residency in internal medicine in the teaching hospitals in Manchester after his graduation in 1988. He passed the membership examination and was admitted as a Member of the Royal College of Physicians (UK) in 1991. He then started his registrar training in gastroenterology in Edinburgh, Scotland between 1991 and 1997. During his training, he gained experience in the management of gastroenterological and liver diseases. He was trained in both diagnostic and therapeutic endoscopy.

He was appointed as an associate consultant gastroenterologist at the Singapore General Hospital in 1997 and subsequently as a senior consultant in 2003. Later, he was also appointed director of the Nutrition Support Team at the Singapore General Hospital. He was responsible for the care of patients on percutaneous endoscopic gastrostomy (PEG) and home parenteral nutrition.

He has published over thirty original research papers in biliary diseases, Helicobacter pylori infection and nutrition.