Colin Michael Foale is a British-American astrophysicist with dual citizenship and a NASA astronaut. He is a veteran of six space shuttle missions and extended stays on both Mir and the International Space Station. He was the first Briton to perform a space walk, and until 17 April 2008, he held the record for most time spent in space by a US citizen: 374 days, 11 hours, 19 minutes. He still holds the cumulative-time-in-space record for a UK citizen. Foale joined the mission operations directorate of NASA in Houston in 1983 aged 26, working on the shuttle’s navigation system. Born with dual-UK/US citizenship, he applied and was turned down twice as an astronaut candidate. After the Space Shuttle Challenger disaster in January 1986, Foale changed his application essay from writing about his dreams to focusing on the realities of leadership faced by NASA, and was selected in 1987.