Mark Edward Kelly is an American politician, retired U.S. Navy captain, and former NASA astronaut. As an astronaut, he commanded the final mission of Space Shuttle Endeavour, STS-134, in May 2011. After retiring from NASA and the Navy, Kelly co-founded the gun control advocacy organization Giffords. He was elected to the United States Senate from Arizona in a 2020 special election and was re-elected to a full term in 2022.