Peggy Whitson

Peggy Whitson, PhD, America’s most experienced astronaut, served as commander on Axiom Mission 2 (Ax-2) and Axiom Mission 4 (Ax-4). During her record-breaking NASA career, she flew on three long-duration space flights and accumulated 665 days in space (now 695 after the Ax-4 mission), more than any other American astronaut or woman astronaut in the world.

Whitson has over 38 years of space and science experience with NASA, as a consultant and now as director of human spaceflight for Axiom Space. Throughout her career, she has held various positions, including NASA’s chief of the Astronaut Office, two-time commander of the International Space Station, chair of NASA’s Astronaut Selection Board, chief of NASA’s Operations Branch, and deputy division chief for both Medical Sciences and the Astronaut Office, as well as co-chair of the U.S.-Russian Mission Science Working Group.

During Ax-2, Whitson became the first female commander of a private astronaut mission, adding to her accomplishment as the first female commander of the International Space Station, the only woman to serve as station commander twice, and the first woman, non-military chief of NASA’s Astronaut Office.

During her three previous space missions to the International Space Station (Expeditions 5, 16, 50/51/52), Whitson conducted 10 spacewalks with over 60 hours to her credit and performed hundreds of research experiments on board the orbiting laboratory. On her first long-duration International Space Station mission (Expedition 5), she was named the first NASA science officer conducting 21 investigations in human life sciences and microgravity sciences, as well as commercial payloads. Throughout her career, she has contributed to hundreds of experiments in biology, biotechnology, physical science, and Earth science, and welcomed several cargo spacecraft delivering tons of supplies and research experiments.

Whitson received degrees in biology and chemistry from Iowa Wesleyan and a doctoral degree in biochemistry from Rice University.

She grew up on a farm outside the town of Beaconsfield, Iowa, with her siblings and parents, who were farmers. She decided to become an astronaut after she watched the first moon landing on television as a child in 1969.

Whitson has been honored with numerous awards, including NASA medals in Leadership, Outstanding Leadership, and Exceptional Service; Michael Collins Trophy for Lifetime Achievement (2024); Forbes 50 over 50 (2023); TIME 100 Most Influential People in the World (2018); Women in Aviation Lifetime Achievement Award (2017); and U.S. Astronaut Hall of Fame inductee (2025).