Timothy Kopra

Timothy Lennart Kopra is an American engineer, a colonel in the United States Army, and a retired NASA astronaut. He served aboard the International Space Station as a flight engineer for Expedition 20, returning to Earth aboard Space Shuttle Discovery on the STS-128 mission on September 11, 2009. He returned to the ISS for the second time in December 2015, as part of Expedition 46 and as the commander of Expedition 47.

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