Shannon Walker (born 4 June 1965 in Houston Texas) is an American scientist and a NASA astronaut whose first space mission was Expedition 24 on the International Space Station with take-off on 15 June 2010. She is married to a fellow NASA astronaut the Australian-born Andy Thomas. She is a member of the Aircraft Owners and Pilots Association (AOPA) and The Ninety-Nines International Organization of Women Pilots.
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