Phunchai Charatcharoenwitthaya (MD, M.Sc.) is a professor at the Faculty of Medicine Siriraj Hospital, Mahidol University, and a consultant hepatologist in the Gastroenterology Unit at Siriraj Piyamaharajkarun Hospital. His research areas include examining nonalcoholic fatty liver disease (NAFLD), chronic viral hepatitis, and cirrhosis with complications. He has published over 80 peer-reviewed publications. He was a research fellow at the Mayo Clinic (Rochester, USA).