FILE - In this April 28, 2009 file photo, then-acting Pennsylvania Physician General Dr. Stephen Ostroff speaks in Harrisburg, Pa. Food and Drug (FDA) Commissioner Margaret Hamburg has told employees she is resigning her post in March. Hamburg told employees of the Food and Drug Administration in an email Thursday that the agency's chief scientist, Stephen Ostroff, will serve as acting commissioner. (AP Photo/Carolyn Kaster, File)