Dafydd Williams

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Dafydd Williams OC OOnt FCFPC FRCPC FRCP FRCGS
Official portrait, 2006
Born	Dafydd Rhys Williams (1954-05-16) May 16, 1954 (age 70) Saskatoon, Saskatchewan, Canada
Education	McGill University (BSc, MSc, MD, ChM)
Spouse	Cathy Fraser
Children	3
Awards	Royal Canadian Geographical Society Gold Medal (2017) Order of Ontario (2015) Order of Canada (2013) Diamond Jubilee Medal (2012) Canadian Aviation Hall of Fame (2012) NASA Exceptional Service Medal (2008) NASA Outstanding Leadership Medal (2002)
Space career
CSA astronaut
Time in space	28 days, 15 hours, 47 minutes
Selection	1992 CSA Group NASA Group 15 (1994)
Total EVAs	3
Total EVA time	17 hours, 47 minutes
Missions	STS-90 STS-118
Mission insignia
Website	astrodavemd.ca

Dafydd "David" Rhys Williams^[1] (born May 16, 1954)^[2] is a Canadian physician, public speaker, author and retired CSA astronaut.^[3] Williams was a mission specialist on two 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. During that mission he performed three spacewalks, becoming the third Canadian to perform a spacewalk and setting a Canadian record for total number of spacewalks.^[4] These spacewalks combined for a total duration of 17 hours and 47 minutes.^[3]

In 1998, Williams became the first non-American to hold a senior management position within NASA, when he held the position of Director of the Space and Life Sciences Directorate at the Johnson Space Center and Deputy Associate Administrator of the Office of Spaceflight at NASA Headquarters.^[3]