Scott Joseph Kelly is an American engineer, retired astronaut, and naval aviator. A veteran of four space flights, Kelly commanded the International Space Station on Expeditions 26, 45, and 46.
Kelly's first spaceflight was as pilot of Space Shuttle Discovery during STS-103 in December 1999. This was the third servicing mission to the Hubble Space Telescope, and lasted for just under eight days. Kelly's second spaceflight was as mission commander of STS-118, a 12-day Space Shuttle mission to the ISS in August 2007. Kelly's third spaceflight was as a crewmember on Expedition 25/26 on the ISS. He arrived at the ISS aboard Soyuz TMA-01M on 9 October 2010, and served as a flight engineer until he took over command of the station on 25 November 2010 at the start of Expedition 26. Expedition 26 ended on 16 March 2011 with the departure of Soyuz TMA-01M.
In November 2012, Kelly and Russian cosmonaut Mikhail Kornienko were selected for a year-long mission to the ISS. Their year in space began with the launch of Soyuz TMA-16M on March 27, 2015, and they remained on the station for Expeditions 43, 44, 45, and 46.