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Mark Barr McClellan (born June 26, 1963) is the director of the Robert J Margolis Center for Health Policy and the Margolis Professor of Business, Medicine and Health Policy at Duke University. Formerly, he was a senior fellow and director of the Health Care Innovation and Value Initiative at the Engelberg Center for Health Care Reform at The Brookings Institution, in Washington, D.C. McClellan served as commissioner of the United States Food and Drug Administration under President George W. Wikipedia