The United States order of precedence is an advisory document maintained by the Ceremonials Division of the Office of the Chief of Protocol of the United States which lists the ceremonial order,or relative preeminence,for domestic and foreign government officials at diplomatic,ceremonial,and social events within the United States and abroad. The list is used to mitigate miscommunication and embarrassment in diplomacy,and offer a distinct and concrete spectrum of preeminence for ceremonies. Often the document is used to advise diplomatic and ceremonial event planners on seating charts and order of introduction. Former presidents,vice presidents,first ladies,second ladies,and secretaries of state and retired Supreme Court justices are also included in the list.
A guidance system is a virtual or physical device,or a group of devices implementing a controlling the movement of a ship,aircraft,missile,rocket,satellite,or any other moving object. Guidance is the process of calculating the changes in position,velocity,altitude,and/or rotation rates of a moving object required to follow a certain trajectory and/or altitude profile based on information about the object's state of motion.
Pamela Ann Melroy is an American retired United States Air Force officer and NASA astronaut serving as the deputy administrator of NASA. She served as pilot on Space Shuttle missions STS-92 and STS-112 and commanded mission STS-120 before leaving the agency in August 2009. After serving as deputy program manager of Space Exploration Initiatives with Lockheed Martin,Melroy joined the Federal Aviation Administration in 2011,where she was a senior technical advisor and director of field operations for the FAA's Office of Commercial Space Transportation.
George Michael Low was an administrator at NASA and the 14th president of the Rensselaer Polytechnic Institute. Low was one of the senior NASA officials who made decisions as manager of the Apollo Spacecraft Program Office in the Apollo program of crewed missions to the Moon.
Horton Guyford Stever was an American administrator,physicist,educator,and engineer. He was a director of the National Science Foundation.
Michael Douglas Griffin is an American physicist and aerospace engineer who served as the Under Secretary of Defense for Research and Engineering from 2018 to 2020. He previously served as Deputy of Technology for the Strategic Defense Initiative,and as Administrator of NASA from April 13,2005,to January 20,2009. As NASA Administrator Griffin oversaw such areas as private spaceflight,future human spaceflight to Mars,and the fate of the Hubble telescope.
Rex Geveden is the president and chief executive officer of BWX Technologies. Previously he was chief operating officer.
Hans Michael Mark was a German-born American government official who served as Secretary of the Air Force and as a Deputy Administrator of NASA. He was an expert and consultant in aerospace design and national defense policy.
The administrator of the National Aeronautics and Space Administration is the highest-ranking official of NASA,the national space agency of the United States. The administrator is NASA's chief decision maker,responsible for providing clarity to the agency's vision and serving as a source of internal leadership within NASA. The office holder also has an important place within United States space policy,and is assisted by a deputy administrator.
Christopher J. Scolese is an American engineer and intelligence official serving as the director of the National Reconnaissance Office. He was appointed the 19th director of the National Reconnaissance Office (DNRO) on August 1,2019. Scolese was sworn into office on August 5,2019.
Daniel R. Mulville is an American engineer who served briefly as Acting Administrator of NASA in 2001.
William H. Gerstenmaier is an aerospace engineer and policymaker who is Vice President,Build and Flight Reliability at SpaceX. He previously served as NASA's Associate Administrator for Human Exploration and Operations between 2005 and July 10,2019. While in that role,he was described as "arguably the most influential person when it comes to US spaceflight." Prior to being Associate Administrator,Gerstenmaier served as the International Space Station Office Program Manager,at Johnson Space Center,a position he began in June 2002. He spent a total of four decades with NASA.
Robert M. Lightfoot Jr. is former Acting Administrator of the National Aeronautics and Space Administration (NASA),serving from January 20,2017 until April 23,2018. Succeeding Charles Bolden,Lightfoot became the space agency's acting Associate Administrator on March 5,2012. That job became permanent on September 25,2012. He had previously served as the eleventh Director of the NASA Marshall Space Flight Center in Huntsville,Alabama,from March 2009 until his promotion in March 2012. On March 12,2018 he announced his retirement from NASA effective April 30,2018.
Robert David Braun is an American aerospace engineer and academic. He has served as the dean of the College of Engineering and Applied Science at the University of Colorado Boulder,the David and Andrew Lewis Professor of Space Technology at the Georgia Institute of Technology,and the NASA Chief Technologist. Currently,Dr. Braun is the Space Sector Head at the Johns Hopkins University Applied Physics Laboratory (APL).
Mason Peck is an associate professor at Cornell University and former NASA Chief Technologist. His immediate predecessor in the NASA position was Bobby Braun.
David W. Miller is an American aerospace engineer who is the current Jerome Hunsaker Professor of Aeronautics and Astronautics at Massachusetts Institute of Technology and an elected Fellow of the American Institute of Aeronautics and Astronautics since 2015. He is currently on a leave of absence from MIT to be a VP and the Chief Technology Officer to The Aerospace Corporation. He has worked on multiple NASA projects and served as NASA Chief Technologist.
Stephen G. Jurczyk is an American engineer who served as the Acting Administrator of NASA. He previously worked at Langley Research Center in Hampton,Virginia.
The Space Systems Laboratory (SSL) is in the Department of Aeronautics and Astronautics at the Massachusetts Institute of Technology in Cambridge,MA. Its mission is to develop the technology and systems analysis associated with small spacecraft,precision optical systems,and International Space Station technology research and development.
The Deputy Administrator of the National Aeronautics and Space Administration is the second-highest-ranking official of NASA,the national space agency of the United States. Administrator of NASA is NASA's chief decision maker,responsible for providing clarity to the agency's vision and serving as a source of internal leadership within NASA. The office holder also has an important place within United States space policy.
