Mark McClellan, who is serving as director of Duke University's Margolis Center for Health Policy said the American people can trust the process. Mark McClellan, who is serving as director of Duke University's Margolis Center for Health Policy said the American people can trust the process. "The American people can trust the process -- that's reviewing all the data quickly," said former FDA commissioner Mark McClellan, who is currently serving as director of Duke University's Margolis Center for Health Policy.