Robert S. Tan MD, MBA, AGSF is Founder & Director of the OPAL Medical Clinic. He is board certified in Family Medicine & Geriatric Medicine. He is also certified with the Royal College of Physicians London, Royal Australian College General Practitioners, American College of Physician Executives & American Medical Directors Association. He is a member of the American Association Clinical Endocrinologists and Fellow of the American Geriatrics Society. His academic appointments include Clinical Professor of Family Medicine at the University of Texas and also was Associate Professor of Internal Medicine at Baylor College of Medicine, where he spent many years caring for veterans. Dr Tan was voted by his peers to be in the prestigious Best Doctors in America for several consecutive years since 2001.