Alan G. Poindexter Status: Deceased 11/5/1961 – 7/1/2012 Nationality: American Type: Government Agency: National Aeronautics and Space Administration Alan Goodwin “Dex” Poindexter was an American naval officer and a NASA astronaut. Poindexter was selected in the 1998 NASA Group (G17) and went into orbit aboard Space Shuttle missions STS-122, and STS-131.