The Administrator and Deputy Administrator of NASA are the highest-ranked officials of NASA, the space agency of the United States. The Administrator serves as the senior space science adviser to the President of the United States. According to NASA, the role of the Administrator is to "lead the NASA team and manage its resources to advance the Vision for Space Exploration." The Deputy Administrator of NASA "serves as the agency’s second in command and is responsible to the administrator for providing overall leadership, planning, and policy direction for the agency. He represents NASA to the Executive Office of the President, Congress, heads of federal and other appropriate government agencies, international organizations, and external organizations and communities. He also oversees the day to day work of NASA’s functional offices, such as the Office of the Chief Financial Officer, Office of General Counsel and Strategic Communications", according to NASA (referring to Shana Dale).
The first Administrator of NASA was Dr. T. Keith Glennan; during his term he brought together the disparate projects in space development research in the US.Daniel Goldin held the post for the longest term (nearly 10 years), and is best known for pioneering the "faster, better, cheaper" approach to space programs. The only person to hold the post twice is James C. Fletcher, who returned to NASA following the Challenger disaster.