Dr Tan Poh Seng is a senior consultant gastroenterologists in Singapore with  extensive clinical expertise in digestive diseases, endoscopic procedures (gastroscopy, sigmoidoscopy, colonoscopy, polypectomy, endoscopic variceal ligation and capsule endoscopy), liver diseases, viral hepatitis, fatty liver, liver cirrhosis, liver cancer and liver transplantation.

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Prior to entering private practice, Dr Tan was the Director of Clinical Services and a senior consultant of the Division of Gastroenterology & Hepatology, National University Hospital (NUH), a senior consultant of the Liver Transplant Programme at the National University Centre for Organ Transplantation and the Clinical Lead for the Hepatobiliary Tumor Group at the National University Cancer Institute. He was also an assistant professor at the Yong Loo Lin School of Medicine, National University of Singapore and a core faculty member for the Gastroenterology & Hepatology Senior Residency programme at NUH. 

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Dr Tan graduated from the University of Melbourne in Australia (MBBS) with an honours degree in 2003 and returned to Singapore for his postgraduate training in 2004. He completed his basic specialist training and obtained the Membership of the Royal College of Physicians MRCP (UK), as well as his Master of Medicine (Singapore) in 2007. Dr Tan received further advanced specialist training in Gastroenterology & Hepatology and was certified by the Specialists Accreditation Board of Singapore in 2011. He further undertook his fellowship and research training in advanced hepatology and transplant hepatology at the Recanati/Miller Transplantation Institute and the Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai (New York, USA).