Dr. Dafydd Rhys Dave Williams OC (born May 16 1954) is a Canadian physician and a retired CSA astronaut. He had two spaceflights both of which were Space Shuttle missions. His first spaceflight STS-90 in 1998 was a 16-day mission aboard Space Shuttle Columbia dedicated to neuroscience research. His second flight STS-118 in August 2007 was flown by Space Shuttle Endeavour to the International Space Station.
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