Tracy Caldwell Dyson

Tracy Caldwell Dyson
Caldwell Dyson in April 2007
Born	Tracy Ellen Caldwell (1969-08-14) August 14, 1969 (age 54) Arcadia, California, U.S
Education	California State University, Fullerton (BS) University of California, Davis (MS, PhD)
Space career
NASA astronaut
Time in space	Currently in space
Selection	NASA Group 17 (1998)
Total EVAs	3
Total EVA time	22h 49m
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 part of the Expedition 23 and Expedition 24 crew on the International Space Station from April 2010 to September 2010. She has completed three spacewalks, logging more than 22 hours of extravehicular activity.^[1][2] She is currently in space since March 23, 2024 for a third time, for a six-month mission onboard the ISS.