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. Dr. Tan’s main interests are in Aging and the impact on Hormones. He manages to combine superb bedside manners and a state of the art advanced medical practice. He is globally renowned for his cutting edge research on aging, andropause, depression and cognitive loss. He is a pioneer and expert on the impact of aging on androgens. He has been interviewed by New York Times, Washington Post, Houston Chronicle etc., and also invited to national television (NBC News, CNN, ABC etc.) to express his views on Men’s Health. He is also an accomplished author and researcher. He has published more than 100 scientific papers and lectures frequently at medical conferences around the globe. He is on the advisory board of the Society for the Study of Androgen Deficiency & the International Society for Men’s Health.