Dafydd Williams

Last updated
Dafydd Williams

Dafydd Williams.jpg
Born (1954-05-16) May 16, 1954 (age 65)
StatusRetired [1]
Nationality Canadian
Occupation Scientist
Emergency Physician
Awards 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 and 47 minutes
Selection 1992 CSA Group
Total EVAs
Total EVA time
17 hours 47 minutes
Missions STS-90, STS-118
Mission insignia
Sts-90-patch.svg STS-118 patch new.png
Website astrodavemd.ca

Dafydd Rhys "Dave" Williams OC OOnt CCFP FCFP FRCPC FRCP (born May 16, 1954 [2] ) is a Canadian physician, public speaker, CEO, author and a 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]

Order of Canada order

The Order of Canada is a Canadian national order and the second highest honour for merit in the system of orders, decorations, and medals of Canada. It comes second only to membership in the Order of Merit, which is the personal gift of Canada's monarch.

Order of Ontario order

The Order of Ontario is the most prestigious official honour in the Canadian province of Ontario. Instituted in 1986 by Lieutenant Governor Lincoln Alexander, on the advice of the Cabinet under Premier David Peterson, the civilian order is administered by the Lieutenant Governor-in-Council and is intended to honour current or former Ontario residents for conspicuous achievements in any field.

College of Family Physicians of Canada organization

The College of Family Physicians of Canada is a professional association and the legal certifying body for the practice of family medicine in Canada. This national organization of family physicians was founded in 1954 and incorporated in 1968. Although membership is not mandatory to practice medicine, it currently numbers over 38,000 members. Members of the CFPC belong to the national College, as well as to their provincial or territorial chapters. The CFPC uses both English and French as official communication languages.


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]

Johnson Space Center NASA field center in Houston, Texas

The Lyndon B. Johnson Space Center (JSC) is the National Aeronautics and Space Administration's Manned Spacecraft Center, where human spaceflight training, research, and flight control are conducted. It was built and leased to NASA by Joseph L. Smith & Associates, Inc. It was renamed in honor of the late U.S. president and Texas native, Lyndon B. Johnson, by an act of the United States Senate on February 19, 1973.


Williams attended high school in Beaconsfield, Quebec and earned a Bachelor of Science in biology from McGill University in 1976, a Master of Science in physiology, and a Doctor of Medicine and Master of Surgery from McGill University in 1983. He completed a residency in family practice in the Faculty of Medicine, University of Ottawa, in 1985 and obtained fellowship in emergency medicine from the Royal College of Physicians and Surgeons of Canada, following completion of a residency in emergency medicine at the University of Toronto, in 1988. [3]

Beaconsfield, Quebec City in Quebec, Canada

Beaconsfield is a suburb on the Island of Montreal, Quebec, Canada. Incorporated in 1910, named in honour of Benjamin Disraeli, Earl of Beaconsfield, Prime Minister of the United Kingdom and close confidant of Queen Victoria, the city's historical roots go back as far as 1698. It is part of the Greater Montreal region locally referred to as the West Island. It is a prestigious residential community located on the north shore of Lac Saint-Louis, bordered on the west by Baie-D'Urfé, north by Kirkland and east by Pointe-Claire. Beaconsfield, in its current form, was developed as a cottage community by affluent Montreal residents. Over the decades, the city has transformed from summer homes, to year-round residents, and has flourished.

A Bachelor of Science is an undergraduate academic degree awarded for completed courses that generally last three to five years, or a person holding such a degree.

McGill University English-language university in Montreal, Quebec

McGill University is a public research university in Montreal, Quebec, Canada. It was established in 1821 by royal charter, granted by King George IV. The university bears the name of James McGill, a Montreal merchant originally from Scotland whose bequest in 1813 formed the university's precursor, McGill College.

Medical career

Williams received postgraduate training in advanced invertebrate physiology at the Friday Harbor Laboratories of the University of Washington. [3] Subsequently, his interests switched to vertebrate neurophysiology when, for his master's thesis, he became involved in basic science research on the role of adrenal steroid hormones in modifying the activity of regions within the central nervous system involved in the regulation of sleep-wake cycles. While working in the Neurophysiological Laboratories at the Allan Memorial Institute for Psychiatry, he assisted in clinical studies of slow wave potentials within the central nervous system. [3]

Physiology science of the function of living systems

Physiology is the scientific study of the functions and mechanisms which work within a living system.

Friday Harbor Laboratories marine biology field station of the University of Washington

Friday Harbor Laboratories (FHL), is a marine biology field station of the University of Washington, located in Friday Harbor, San Juan Island, Washington, United States. Friday Harbor Labs is known for its intensive summer classes offered to competitive graduate students from around the world in fields of marine biology and other marine sciences.

University of Washington Public research university in Seattle, Washington, United States

The University of Washington is a public research university in Seattle, Washington.

His clinical research in emergency medicine has included studies evaluating the initial training and skill retention of cardiopulmonary resuscitation skills, patient survival from out-of-hospital cardiac arrest, the early identification of trauma patients at high risk, and the efficacy of tetanus immunization in the elderly. [3]

Cardiopulmonary resuscitation emergency procedure that combines chest compressions often with artificial ventilation in an effort to manually preserve intact brain function

Cardiopulmonary resuscitation (CPR) is an emergency procedure that combines chest compressions often with artificial ventilation in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest. It is recommended in those who are unresponsive with no breathing or abnormal breathing, for example, agonal respirations.

Cardiac arrest sudden stop in effective blood flow due to the failure of the heart to contract effectively

Cardiac arrest is a sudden loss of blood flow resulting from the failure of the heart to effectively pump. Signs include loss of consciousness and abnormal or absent breathing. Some individuals may experience chest pain, shortness of breath, or nausea before cardiac arrest. If not treated within minutes, it typically leads to death.

Tetanus A serious infectious disorder that follows wound contamination by the Gram-positive bacterium Clostridium tetani. The bacteria produce a neurotoxin called tetanospasmin, which causes muscle spasm in the jaw and other anatomic sites.

Tetanus, also known as lockjaw, is a bacterial infection characterized by muscle spasms. In the most common type, the spasms begin in the jaw and then progress to the rest of the body. Each spasm usually lasts a few minutes and spasms occur frequently for three to four weeks. Spasms may be severe enough to cause bone fractures. Other symptoms of tetanus may include fever, sweating, headache, trouble swallowing, high blood pressure, and a fast heart rate. Onset of symptoms is typically three to twenty-one days following infection. Recovery may take months. About ten percent of cases prove fatal.

In 1988 he became an emergency physician with the department of emergency services at Sunnybrook Health Science Centre as well as a lecturer with the Department of Surgery at the University of Toronto. He served as a member of the Air Ambulance Utilization Committee with the Ontario Ministry of Health both as an academic emergency physician and later as a representative of community emergency physicians. In addition, he has trained ambulance attendants, paramedics, nurses, residents, and practicing physicians in cardiac and trauma resuscitation as a course director in Advanced Cardiac Life Support (ACLS) with the Canadian Heart and Stroke Foundation and in Advanced Trauma Life Support with the American College of Surgeons. [3]

Paramedic healthcare professional who works in emergency medical situations

A paramedic is a specialist healthcare professional who responds to emergency calls for medical help outside of a hospital. Paramedics mainly work as part of the emergency medical services (EMS), most often in ambulances. The scope of practice of a paramedic varies among countries, but generally includes autonomous decision making around the emergency care of patients.

American College of Surgeons organization

The American College of Surgeons is an educational association of surgeons founded in 1912. Headquartered in Chicago, Illinois, the College provides membership for doctors worldwide specializing in surgery who pass a set of rigorous qualifications.

From 1989 to 1990, he served as an emergency physician with the Emergency Associates of Kitchener-Waterloo and as Medical Director of the Westmount Urgent Care Clinic. In 1990 he returned to Sunnybrook as Medical Director of the ACLS program and coordinator of postgraduate training in emergency medicine. Subsequently, he became the Director of the Department of Emergency Services at Sunnybrook Health Science Centre, Assistant Professor of Surgery, University of Toronto, and Assistant Professor of Medicine, University of Toronto. [3] He remains active in life science and space medicine research, both as a Principal Investigator and as a Co-Investigator.

In April 2008, Williams was recruited by McMaster University as a physician-scientist where he was the director for the new McMaster Centre for Medical Robotics at St. Joseph's Healthcare Hamilton. [5]

On May 18, 2011, Williams became the new President and CEO of Southlake Regional Health Centre, the regional hospital in Newmarket, Ontario, to lead the facility into becoming a full-fledged teaching and research centre. He continued in this role until October 2017 when he left Southlake to work as a healthcare and aerospace consultant.

Astronaut career

Williams was selected by the Canadian Space Agency in June 1992. He completed basic training and in May 1993 was appointed manager of the Missions and Space Medicine Group within the astronaut program. His collateral duty assignments have included supervising the implementation of operational space medicine activities within the astronaut program and the coordination of the Canadian Astronaut Program Space Unit Life Simulation (CAPSULS) Project. In February 1994 he participated in a 7-day space mission simulation. During this CAPSULS Project he was the Principal Investigator of a study to evaluate the initial training and retention of resuscitation skills by non-medical astronauts. He was also assigned as one of the crewmembers and acted as the crew medical officer. He announced his retirement as an astronaut on 29 February 2008, effective from 1 March 2008. [1]

NASA experience

The NEEMO 9 Crew: Left to right (rear): Dr. Tim Broderick, Williams; front: Nicole Stott, Ron Garan. NEEMO 9.jpg
The NEEMO 9 Crew: Left to right (rear): Dr. Tim Broderick, Williams; front: Nicole Stott, Ron Garan.

In January 1995, Williams was selected to join the 1995 international class of NASA mission specialist astronaut candidates. He reported to the Johnson Space Center in March 1995 and completed training and evaluation in May 1996. On completing basic training, he was assigned to work technical issues for the payloads/habitability branch of the astronaut office.

From July 1998 to November 2002, Williams served as Director of the Space and Life Sciences directorate with responsibility for research in both physical and biomedical space sciences at the Johnson Space Center (JSC). With this appointment, he became the first non-American to hold a senior management position within NASA. [3] Overall crew medical safety was one of his principal concerns, in addition to flight medical operations and JSC occupational and environmental health. His programs were directed toward protecting astronauts from the hazards of the space environment, including space radiation and microgravity, in addition to maintaining their medical, physical, and psychological well-being while aloft and on return to Earth. His other oversight responsibilities were in the fields of telemedicine, 3-D tissue culture/regeneration in microgravity, the curatorial management of extraterrestrial materials, and of qualifying humans for very long space journeys and ensuring their safe return to Earth.

Williams served as an aquanaut on the first NEEMO (NASA Extreme Environment Mission Operations) crew aboard the Aquarius underwater laboratory in October 2001. [4] [6] During this mission, he was thrilled to shake hands underwater with Canadian underwater explorer Joe MacInnis. [7] Williams was originally scheduled to command NEEMO 7 in October 2004, but was replaced by back-up crewmember and fellow CSA astronaut Robert Thirsk due to Williams undergoing review of a temporary medical issue. [8] [9] In April 2006, Williams commanded the NEEMO 9 mission. During this eighteen-day mission, the six-person crew developed lunar surface exploration procedures and telemedical technology applications. [4] [10]

Williams undergoing a pulmonary function test during the Neurolab mission. Dave Williams Neurolab test.jpg
Williams undergoing a pulmonary function test during the Neurolab mission.


Williams was mission specialist 3 on STS-90 Neurolab (April 17 to May 3, 1998). During the 16-day Spacelab flight, the seven-person crew aboard space shuttle Columbia served as both experiment subjects and operators for 26 individual life science experiments focusing on the effects of microgravity on the brain and nervous system. The STS-90 flight orbited the Earth 256 times, covered 6.3 million miles, and logged Williams over 381 hours in space. [11]


Williams was assigned to the crew of STS-118 (August 8 to 21, 2007), an assembly mission to the International Space Station. He completed three spacewalks during this mission, and set two new records during his final EVA on Saturday, 18 August: he is the Canadian with the most spacewalks (3) and Williams ended Saturday's EVA with a total duration of 17 hours, 47 minutes of extravehicular time. [12] He was the second Canadian to lead an EVA and is one of three Canadian astronauts who have performed EVAs. [13]

Awards and honours

He is a member of the College of Physicians and Surgeons of Ontario, the Ontario Medical Association, the College of Family Physicians of Canada, the Royal College of Physicians and Surgeons of Canada, the Canadian Association of Emergency Physicians, the Aerospace Medical Association, the Canadian Society for Aerospace Medicine, and the Canadian Aeronautics and Space Institute. Past affiliations include the Society for Neuroscience, the New York Academy of Science, and the Montreal Physiological Society. [3]

Williams was awarded the Commonwealth Certificate of Thanks in 1973 and the Commonwealth Recognition Award (1975) for his contribution to the Royal Life Saving Society of Canada. Academic awards include the A.S. Hill Bursary, McGill University, in 1980; the Walter Hoare Bursary, McGill University, in 1981; and the J.W. McConnell Award, McGill University, from 1981 to 1983. He was named Faculty Scholar in 1982 and University Scholar in 1983 by the faculty of medicine at McGill University. In 1983, he also received the psychiatry prize and the Wood Gold Medal for clinical excellence from the Faculty of Medicine and was named on the dean's honour list by the physiology department, at McGill University, for his postgraduate research. [3] He was twice awarded the second prize for his participation in the University of Toronto Emergency Medicine Research Papers Program, in 1986, and 1988, [3] and received top honours in that competition in 1987.[ citation needed ]

Following STS-90, in 1999 he received the Melbourne W. Boynton Award from the American Astronautical Society and the Bronze Medal from the Spanish Council for Scientific Research (CSIC). In 2000 He received the Individual Achievement Award from the Rotary National Award for Space Achievement and was made a patron of the International Life Saving Society in 2002. He was recognized with the NASA Outstanding Leadership Medal in 2002, a JSC Space and Life Sciences Directorate Special Professional Achievement Award, and in 2004 a NASA Astronaut Office GEM Award and Langley Research Center Superior Accomplishment Award. With the crew of STS-118, in 2008 he received the Federation Aeronautique Internationale Medaille de la Vaulx Award and the V.M. Komarov Diploma followed by a NASA Exceptional Service Medal.

In 2012, Williams was inducted into the Canada's Aviation Hall of Fame. [14] He received the Queen Elizabeth II Diamond Jubilee Medal later that year and the following year Williams was made an Officer of the Order of Canada in 2013 for his work in space exploration. [15] He received the Order of Ontario in 2015 and the Award of Excellence from the College of Family Physicians of Canada later that year.

Honorary Degrees

Williams has received the following honorary degrees; Honorary Doctorate of Laws, University of Saskatchewan (2004), Honorary Doctorate of Science, McGill University (2007), Honorary Doctorate of Science, University of Wales (2007), Honorary Doctorate of Science, Queen's University 2009, Honorary Doctorate of Laws, Dalhousie University (2016).


Personal life

Williams was born in Saskatoon, Saskatchewan [3] and is married to Cathy Fraser of Pointe-Claire, Quebec. [16] [17] They have three children, Evan (born in 1994) and Olivia (born in 1997) [16] and Theo (born in 2003) He enjoys flying, scuba diving, hiking, sailing, kayaking, canoeing, downhill and cross-country skiing. [3] As his name indicates, he is of Welsh descent. [18] [19]

Related Research Articles

Chris Hadfield retired Canadian astronaut

Chris Austin Hadfield is a Canadian retired astronaut, engineer, and former Royal Canadian Air Force fighter pilot. The first Canadian to walk in space, Hadfield has flown two Space Shuttle missions and served as commander of the International Space Station.

Robert Thirsk Canadian engineer and physician, and former CSA astronaut

Robert Brent Thirsk, is a Canadian engineer and physician, and a former Canadian Space Agency astronaut. He holds the Canadian records for the longest space flight and the most time spent in space. He became an officer of the Order of Canada (OC) in 2013 and was named to the Order of British Columbia (OBC) in 2012.

David Wolf (astronaut) American astronaut, medical doctor and electrical engineer (born 1956)

David Alexander Wolf is an American astronaut, medical doctor and electrical engineer. Wolf has been to space four times. Three of his spaceflights were short-duration Space Shuttle missions, the first of which was STS-58 in 1993, and his most recent spaceflight was STS-127 in 2009. Wolf also took part in a long-duration mission aboard the Russian space station Mir which lasted 128 days, and occurred during Mir EO-24. He was brought to Mir aboard STS-86 in September 1997, and landed aboard STS-89 in January 1998. In total Wolf has logged more than 4,040 hours in space. He is also a veteran of 7 spacewalks totaling 41hrs 17min in both Russian and American spacesuits.

Peggy Whitson American biochemistry researcher and NASA astronaut

Peggy Annette Whitson is an American biochemistry researcher, retired NASA astronaut, and former NASA Chief Astronaut. Her first space mission was in 2002, with an extended stay aboard the International Space Station as a member of Expedition 5. Her second mission launched October 10, 2007, as the first female commander of the ISS with Expedition 16. She was on her third long-duration space flight and was the commander of the International Space Station for Expedition 51, before handing over command to Fyodor Yurchikhin on June 1, 2017.

Margaret Rhea Seddon Surgeon and former NASA astronaut

Margaret Rhea Seddon is a physician and retired NASA astronaut. After being selected as part of the first group of astronauts to include women, she flew on three Space Shuttle flights: as mission specialist for STS-51-D and STS-40, and as payload commander for STS-58. Both before and after her career in the astronaut program, she has been active in the medical community in Tennessee, Mississippi and Texas.

Daniel T. Barry American astronaut

Daniel Thomas Barry is an American engineer, scientist, and a retired NASA astronaut. He was a contestant on the CBS reality television program Survivor: Panama, as well as on BattleBots on ABC. He was at Singularity University from 2009–2012, where he was co-chair of the Faculty of Artificial Intelligence and Robotics and the chair of the graduate summer program. He is also a co-founder of Fellow Robots, a telepresence robotics company, and the founder and president of Denbar Robotics.

Michael L. Gernhardt NASA astronaut and manager of Environmental Physiology Laboratory

Michael Landon Gernhardt (Ph.D.) is a NASA astronaut and manager of Environmental Physiology Laboratory and principal investigator of the Prebreathe Reduction Program (PRP) at the Lyndon B. Johnson Space Center.

Scott E. Parazynski American astronaut

Scott Edward Parazynski is an American physician and a former NASA astronaut. A veteran of five Space Shuttle flights and seven spacewalks, Parazynski's latest mission was STS-120 in October, 2007 – highlighted by a dramatic, unplanned EVA to repair a live solar array. In May 2016 he was inducted into the United States Astronaut Hall of Fame. He retired from NASA in March 2009 to pursue entrepreneurial opportunities in the private sector, and he is currently the CEO of a technology start-up. He is the first person to have both flown in space and summited Mount Everest, the highest point on Earth.

Michael Fincke United States Air Force officer and NASA astronaut

Edward Michael "Mike"/"Spanky" Fincke is an American astronaut who formerly held the American record for the most time in space. His record was broken by Scott Kelly on October 16, 2015. He was born in Pittsburgh, Pennsylvania, but considers its suburb Emsworth to be his hometown. He is a United States Air Force officer and a NASA astronaut, and served two tours aboard the International Space Station as a flight engineer and commander. He flew on one Space Shuttle mission, STS-134 as a Mission Specialist. Fincke is conversant in Japanese and Russian. He is married to Renita Saikia, and together they have three children; son Chandra and daughters Tarali and Surya.

Nicholas Patrick British-American engineer and former NASA astronaut

Nicholas James MacDonald Patrick, Ph.D., is a British-American engineer and a former NASA astronaut. His flight on the 2006 Discovery STS-116 mission made him the fourth person born in the United Kingdom to go into space.

Douglas H. Wheelock American engineer and astronaut.

Douglas Harry "Wheels" Wheelock is an American engineer and astronaut. He has flown in space twice, logging 178 days on the Space Shuttle, International Space Station, and Russian Soyuz. On July 12, 2011, Wheelock announced that he would be returning to active duty with the United States Army in support of Operation Enduring Freedom.

Clayton Anderson Retired NASA astronaut and member of the ISS Expedition 15 crew

Clayton Conrad Anderson is a retired NASA astronaut. Launched on STS-117, he replaced Sunita Williams on June 10, 2007 as a member of the ISS Expedition 15 crew.

Stanley G. Love American astronaut

Stanley Glen Love, Ph.D. is an American scientist and a NASA astronaut from Oregon.

Andrew J. Feustel Geophysicist and NASA astronaut

Andrew Jay "Drew" Feustel is a geophysicist and a NASA astronaut. Following several years working as a geophysicist, Feustel was selected as an astronaut candidate by NASA in July 2000. His first spaceflight in May 2009, STS-125, lasted just under 13 days. This was a mission with six other astronauts to repair the Hubble Space Telescope, aboard Space Shuttle Atlantis. Feustel performed three spacewalks during the mission. His second spaceflight was STS-134, which launched on May 16, 2011 and landed on June 1, 2011. STS-134 was the penultimate Space Shuttle flight. Feustel returned to space on March 21, 2018 on Soyuz MS-08 with Expedition 55/56. For expedition 56, he commanded the International Space Station, before handing over to Alexander Gerst on October 3, 2018.

Robert Satcher American astronaut

Robert Lee "Bobby" Satcher Jr. is an American physician, chemical engineer, and NASA astronaut. He became the first orthopedic surgeon in space during STS-129. He participated in 2 spacewalks during STS-129, accumulating 12hrs 19min of EVA time. Satcher holds two doctorates and has received numerous awards and honors as a surgeon and engineer. He is married and has two children. Bobby Satcher enjoys running, scuba diving, and reading.

Thomas Marshburn American physician and NASA astronaut

Thomas Henry "Tom" Marshburn is an American physician and a NASA astronaut. He served as a Mission Specialist on STS-127. Marshburn was a member of the Soyuz TMA-07M crew which launched to ISS in December 2012 to join Expedition 34. Served as flight engineer for Expedition 34 and 35.

Michael Barratt (astronaut) American aerospace medicine physician and a NASA astronaut with two flights

Michael Reed Barratt is an American physician and a NASA astronaut. Specializing in aerospace medicine, he served as a flight surgeon for NASA before his selection as an astronaut, and has played a role in developing NASA's space medicine programs for both the Shuttle-Mir Program and International Space Station. His first spaceflight was a long-duration mission to the International Space Station, as a Flight Engineer in the Expedition 19 and 20 crew. In March 2011, Barratt completed his second spaceflight as a crew member of STS-133.

David Saint-Jacques Canadian engineer, astrophysicist, physician and CSA astronaut

David Saint-Jacques is a Canadian astronaut with the Canadian Space Agency (CSA). He is also an astrophysicist, engineer, and a physician.

Josef Schmid (flight surgeon) NASA flight surgeon and Major General in the United States Air Force Reserves

Josef F. Schmid is a German-American physician, NASA flight surgeon and a Major General in the United States Air Force Reserves. He served as an aquanaut on the joint NASA-NOAA NEEMO 12 underwater exploration mission in May 2007.

Sean Roden American physician

Sean Kevin Roden is a NASA flight surgeon was the lead of medical operations for the International Space Station (ISS) from 2004 to 2007.


  1. 1 2 "Canadian Astronaut Dr. Dave Williams Retiring" (Press release). Canadian Space Agency. February 29, 2008.
  2. "CSA - Dr. Dafydd (Dave) Rhys Williams". Canadian Space Agency. March 2008.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 "Astronaut Bio: Dafydd (Dave) R. Williams". NASA. March 2008.
  4. 1 2 3 "Astronaut Dave Williams Biography". astronautdavewilliams.com. Retrieved July 28, 2011.
  5. "Canadian astronaut lands at McMaster". McMaster University Daily News. April 15, 2008. Archived from the original on May 21, 2011.
  6. NASA (March 21, 2006). "NEEMO History". National Aeronautics and Space Administration . Retrieved September 23, 2011.
  7. Williams, Dave (October 22, 2001). "CSA - Aquarius: Neemo Project - Dave Williams - Journal". Canadian Space Agency. Archived from the original on January 1, 2013. Retrieved December 27, 2011.
  8. Canadian Space Agency (October 4, 2004). "CSA - Astronaut Robert Thirsk to Replace Dave Williams for NEEMO 7". Canadian Space Agency. Archived from the original on August 24, 2011. Retrieved September 23, 2011.
  9. NASA (October 9, 2004). "Thirsk replaces Williams as NEEMO 7 commander". Spaceflight Now Inc. Retrieved September 23, 2011.
  10. NASA (2006). "NASA's Undersea Crew is Heads Above Water". NASA. Retrieved September 23, 2011.
  11. "Spaceflight mission report: STS-90". Spacefacts.de.
  12. Blatchford, Andy (2007-08-19). "Astronaut Dave Williams sets Canadian record with third spacewalk". CanadaEast Telegraph-Journal. Retrieved 2007-08-19.
  13. Canadian Space Agency. "Chris Hadfield: Walking in Space". Canadian Space Agency. Archived from the original on 2008-03-07. Retrieved 2007-08-22.
  14. "Member Profiles". Canada's Aviation Hall of Fame. Retrieved 3 January 2018.
  15. Lea, David (4 July 2013). "Oakville astronaut named to Order of Canada". Brampton Guardian. Archived from the original on 4 July 2013.
  16. 1 2 "Dafydd Williams: Family". Spacefacts.de . Retrieved December 15, 2010.
  17. Martin, James (August 2008). "Dr. Spaceman : McGill News". McGill News . Retrieved 27 December 2011.
  18. "BBC News - Astronaut takes dragon into space". July 17, 2007. Retrieved 20 December 2011.
  19. "Dafydd Rhys Williams on BBC Wales Today". BBC. Retrieved 20 December 2011.