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Demetrios previously served as Chief Executive of the Medicare program at the Centers for Medicare & Medicaid Services. He was a Senior Executive for Medicare at UnitedHealthcare, and served as Deputy General Counsel and then Associate Deputy Secretary at the US Department of Health and Human Services where he played a leading role across the department’s agency portfolio, including the Food and Drug Administration, Office for Civil Rights, and Office of the National Coordinator for Health Information Technology. He also built practices at two leading healthcare law firms.