Tracy Caldwell Dyson | |
|---|---|
 Caldwell Dyson in 2023 | |
| Born | Tracy Ellen Caldwell August 14, 1969 Arcadia, California, U.S |
| Education | California State University, Fullerton (BS) University of California, Davis (MS, PhD) |
| Spouse | George Dyson |
| Space career | |
| NASA astronaut | |
Time in space | 372 days 18 hours and 36 minutes |
| Selection | NASA Group 17 (1998) |
Total EVAs | 4 |
Total EVA time | 23 hours and 20 minutes |
| Missions | STS-118 Soyuz TMA-18 (Expedition 23/24) Soyuz MS-25 (Expedition 70/71) |
Mission insignia |      |
| Scientific career | |
| Fields | Physical chemistry |
| Thesis | A Mechanistic and Kinetic Study of Heterocycle and Cyclization Chemistry on Pd(111) Using Laser-Induced Thermal Desorption with Fourier Transform Mass Spectrometry (1997) |
Tracy Caldwell Dyson (born Tracy Ellen Caldwell; August 14, 1969) is an American chemist and NASA astronaut. She was a mission specialist on Space Shuttle Endeavour flight STS-118 in August 2007 and has participated in two long-duration missions to the International Space Station, Expedition 23 and 24 from April to September 2010 and Expedition 70 and 71 from March to September 2024. She has completed four spacewalks, logging nearly 24 hours of extravehicular activity.