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Gregory Reid Wiseman (born November 11, 1975) is an American astronaut, engineer, and naval aviator. He served as Chief of the Astronaut Office until November 14, 2022.
Wiseman was selected in June 2009 as a member of the NASA Astronaut Group 20 and qualified as an astronaut in 2011. Wiseman took part in his first spaceflight as part of the crew of Expedition 40/41, which launched to the International Space Station on May 28, 2014, and returned on November 10, 2014. Before joining NASA, Wiseman was a naval aviator and test pilot. Wiseman was the Deputy Chief of the Astronaut Office from June 2017, working under Chief Astronaut Patrick Forrester. On December 18, 2020, he was promoted to Chief of the Astronaut Office at NASA. In December, 2022. Wiseman stepped down from this position and was replaced by his deputy, Drew Feustel who became acting chief until Joseph Acaba assumed the role as Chief in February, 2023.
Wiseman was selected as commander of the crew for the Artemis 2 flight, which is planned to make a flyby of the Moon in 2025. Wiseman would be the first commander of a lunar mission since Gene Cernan on Apollo 17 in 1972.