Portrait, Shana L. Dale, Deputy Administrator, National Aeronautics and Space Administration (NASA). Washington, DC, November 28, 2005. Photo Credit: (NASA/Bill Ingalls)

Portrait, Michael Griffin, Administrator, National Aeronautics and Space Administration (NASA). Washington, DC, April 25, 2005. Photo Credit: (NASA/Renee Bouchard)

Portrait, Bobby Braun, Chief Technologist, National Aeronautics and Space Administration (NASA). Washington, DC, May 19, 2010. Photo Credit: (NASA/Bill Ingalls)