Jessica Meir is an American marine biologist and NASA astronaut who flew a long-duration mission to the International Space Station beginning in 2019. In October 2019 she and fellow astronaut Christina Koch performed the first all-female spacewalk in history, replacing a failed power component outside the station. Before joining NASA, Meir was a researcher studying animal physiology in extreme environments, including high-altitude bird flight and diving behavior in penguins, work that informed her later interest in human physiology in space.
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