Mark Edward Kelly

Mark Edward Kelly (born February 21, 1964) is a retired American astronaut, engineer and U.S. Navy Captain. He was selected to become a NASA Space Shuttle pilot in 1996 and flew his first mission in 2001 as pilot of STS-108.

He piloted STS-121 in 2006 and commanded STS-124 in 2008 and STS-134 in 2011. STS-134 was his final mission and the final mission of Space Shuttle Endeavour.  Kelly’s identical twin brother, Scott Kelly, is also an astronaut and served as commander of International Space Station (ISS) Expedition 26. The Kelly brothers are the only twins and only siblings to have both travelled in space.

In 2015, his brother was selected to spend a year in space on the ISS. As such, the twin brothers will be studied to find differences between living on Earth and in space.