who flew with the May 2000 mission of the Atlantis space shuttle that delivered equipment and supplies to the International Space Station (ISS) during its construction. During the 10-day flight the Wisconsin native undertook his first space walk, lasting nearly seven hours. Williams returned to the ISS in 2005 for his first long-duration (six-month) stay as part of Expedition 13, then again in 2009 as commander of the ISS as part of Expedition 21, accumulating more than 362 days in space. Williams lifted off again on 24 August 2016, as commander of ISS Expedition 48. During that mission he surpassed 520 days living in space, breaking Scott Kelly’s previous record for most cumulative time spent in space by a US astronaut, set during Kelly’s year-long mission. By the time of his return on 6 September, Williams had logged a new record of 534 hours; the record lasted until 24 April 2017 when Peggy Whitson surpassed that number.