Tracy Caldwell Dyson

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Tracy Caldwell Dyson
Tracy E Caldwell portrait.jpg
Born (1969-08-14) August 14, 1969 (age 50)
Alma mater University of California, Davis
Ph.D. Physical Chemistry, 1997
California State, Fullerton
B.S. Chemistry 1993 [1] [2]
Beaumont High School
Beaumont, CA, 1987 [3] [4]
Occupation Chemist
Space career
NASA Astronaut
Time in space
188 days, 19 hours, 14 minutes
Selection 1998 NASA Group
Total EVAs
Total EVA time
22 hours, 49 minutes
Missions STS-118, Soyuz TMA-18 (Expedition 23/24)
Mission insignia
STS-118 patch new.png Soyuz-TMA-18-Mission-Patch.png ISS Expedition 23 Patch.svg ISS Expedition 24 Patch.svg

Tracy Caldwell Dyson (born Tracy Ellen Caldwell; August 14, 1969) is an American chemist and NASA astronaut. Caldwell Dyson was a Mission Specialist on Space Shuttle Endeavour flight STS-118 in August 2007. She was part of the Expedition 23 and Expedition 24 crew on the International Space Station between April 4, 2010 and September 25, 2010. She has completed three spacewalks, logging more than 22 hrs of EVA including work to replace a malfunctioning coolant pump. [2] [4]


Academic career

As an undergraduate researcher at the California State University, Fullerton (CSUF), Caldwell Dyson designed, constructed and implemented electronics and hardware associated with a laser-ionization, time-of-flight mass spectrometer for studying atmospherically relevant gas-phase chemistry. [1] [5]

Also at CSUF, she worked for the Research and Instructional Safety Office as a lab assistant performing environmental monitoring of laboratories using hazardous chemicals and radioactive materials, as well as calibrating survey instruments and helping to process chemical and radioactive waste. During that time (and for many years prior) she also worked as an electrician/inside wireman for her father's electrical contracting company doing commercial and light industrial type construction. [2]

At the University of California, Davis, Caldwell Dyson taught general chemistry laboratory and began her graduate research. Her dissertation work focused on investigating molecular-level surface reactivity and kinetics of metal surfaces using electron spectroscopy, laser desorption, and Fourier transform mass spectrometry techniques. [6] She also designed and built peripheral components for a variable temperature, ultra-high vacuum scanning tunneling microscopy system. [2]

In 1997, Caldwell Dyson received the Camille and Henry Drefus Postdoctoral Fellowship in Environmental Science to study atmospheric chemistry at the University of California, Irvine. [3] There she investigated reactivity and kinetics of atmospherically relevant systems using atmospheric pressure ionization mass spectrometry, Fourier transform infrared and ultraviolet absorption spectroscopies. In addition, she developed methods of chemical ionization for spectral interpretation of trace compounds. Caldwell Dyson has published and presented her work in numerous papers at technical conferences and in scientific journals. [2]

Caldwell Dyson during celebrations for the 40th anniversary of the first moon landing, 2009 TracyCaldwellByPhilKonstantin.jpg
Caldwell Dyson during celebrations for the 40th anniversary of the first moon landing, 2009

NASA career

Selected by NASA in June 1998, Caldwell Dyson reported for training in August 1998. Her Astronaut Candidate Training included orientation briefings and tours, numerous scientific and technical briefings, intensive instruction in Shuttle and International Space Station (ISS) systems, physiological training, ground school to prepare for T-38 flight training, as well as learning water and wilderness survival techniques. Completion of this training and evaluation qualified her for flight assignment as a mission specialist.

In 1999, Caldwell Dyson was assigned to the Astronaut Office ISS Operations Branch as a Russian Crusader, participating in the testing and integration of Russian hardware and software products developed for ISS. In 2000, she was assigned prime Crew Support Astronaut for the ISS Expedition 5 crew, serving as their representative on technical and operational issues throughout the training and on-orbit phase of their mission.

During ISS Expeditions 4 through 6, Caldwell Dyson also served as an ISS spacecraft communicator (CAPCOM) inside Mission Control. In 2003, she made a transition to the Astronaut Shuttle Operations Branch and was assigned to flight software verification in the Shuttle Avionics Integration Laboratory (SAIL) and also worked supporting launch and landing operations at Kennedy Space Center, Florida. Caldwell Dyson also served as Lead CAPCOM for Expedition 11.

Caldwell Dyson was assigned to, and later flew on STS-118, Space Shuttle Endeavour, on August 8–21, 2007, which was the 119th space shuttle flight, the 22nd flight to the station, and the 20th flight for Endeavour. Caldwell Dyson was assigned as Mission Specialist #1 on this flight. During the mission Endeavour's crew successfully added another truss segment, a new gyroscope and external spare parts platform to the International Space Station. A new system that enables docked shuttles to draw electrical power from the station to extend visits to the outpost was activated successfully. A total of four spacewalks (EVAs) were performed by three crew members. Endeavour carried some 5,000 pounds of equipment and supplies to the station and returned to Earth with some 4,000 pounds of hardware and no longer needed equipment. Traveling 5.3 million miles in space, the STS-118 mission was completed in 12 days, 17 hours, 55 minutes and 34 seconds. Finally, during the flight of STS-118, Caldwell Dyson celebrated her 38th birthday in space.

On April 4, 2010, Caldwell Dyson joined the Expedition 23 crew aboard ISS. She lifted off on April 2, 2010 from the Baikonur spaceport aboard a Russian Soyuz capsule (Soyuz TMA-18). After 176 days duty as part of the Expedition 24 crew, she returned to Earth with the Soyuz TMA-18 landing unit. She has completed three spacewalks, logging more than 22 hrs of EVA including work to replace a malfunctioning coolant pump. [2] [7] Together with commander Aleksandr Skvortsov and flight engineer Mikhail Korniyenko, Dyson landed in Kazakhstan on September 25, 2010. [8] [9]

The three astronauts of STS-131 and Tracy Caldwell (bottom left) of ISS Expedition 23, the first time four women being at the same time in space. STS-131 ISS-23 Four Women.jpg
The three astronauts of STS-131 and Tracy Caldwell (bottom left) of ISS Expedition 23, the first time four women being at the same time in space.

In a television interview on the 40th anniversary of the first moon landing, she said she is the first astronaut who was born after Apollo 11. [11]

As Tracy Dyson, she is the host of a series on NASA TV called StationLife, which focuses on facets of life aboard the International Space Station. [12]

She appeared on Episode 3 of MasterChef Junior Season 4. [13]

On March 21, 2017, Dyson stood behind President Trump as he signed a bill for NASA to send humans to Mars in 2030s and receive $19.5 billion in 2018 funding. Dyson and fellow NASA astronaut Chris Cassidy presented Trump with an official flight jacket during the ceremony. [14]

Personal life

Caldwell Dyson, the younger of two girls, was born in Arcadia, California, [2] and later moved to Beaumont, California, in the early 1980s to attend junior high school where her father worked as an electrician. Her recreational interests include running, weight training, hiking, softball, basketball, and auto repair/maintenance. As an undergraduate, she competed in intercollegiate athletics on the CSUF Titans track team as both a sprinter and long jumper. [15]

Caldwell Dyson is a private pilot and conversational in American Sign Language (ASL) and Russian. [1] [16]

She is married to Naval Aviator George Dyson. [4] She is also the lead vocalist for the all-astronaut band Max Q. [17]

In 2011, Caldwell Dyson served as the guest judge on a space-themed episode of the Food Network show Cupcake Wars . [18]

Caldwell Dyson advised Jessica Chastain when the actress was preparing to appear as an astronaut and mission commander in the 2015 movie The Martian. Chastain said she was very inspired by Caldwell Dyson. [19]

She believes in God, [20] and was raised Methodist,[ citation needed ] but no specific claimed religious affiliation of hers was ever publicly available as an adult.


Caldwell Dyson belongs to the Sigma Xi Research Society and the American Chemical Society. [21]

Awards and honors

Caldwell Dyson in the Cupola module of the International Space Station observing Earth. Tracy Caldwell Dyson in Cupola ISS.jpg
Caldwell Dyson in the Cupola module of the International Space Station observing Earth.

See also

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PD-icon.svg This article incorporates  public domain material from websites or documents ofthe National Aeronautics and Space Administration .

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  20. NASA Preflight Interview of Tracy Caldwell Dyson, 23 March 2010. Dyson says of her education and early career: "but I think God planted enough people in my life that said, you need to just follow your heart, you need to do what interests you." URL:
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