George Whitesides, chief of staff to NASA AdministratorCharles Bolden, is stepping down, according to a U.S. government administrationofficial.
Whitesides, a former executive director of the NationalSpace Society and adviser to VirginGalactic, will be replaced starting May 10 by David Radzanowski, a formerWhite House Office of Management and Budget official who joined NASA in 2006,and currently serves as deputy associate administrator for program integrationwithin NASA?s Space Operations Mission Directorate, the official said.
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