Mark Kelly is a former U.S. Navy combat pilot and NASA astronaut who has served as a U.S. senator from Arizona since 2020. He earned a bachelor’s degree in marine engineering and nautical science from the U.S. Merchant Marine Academy and a master’s degree in aeronautical engineering from the Naval Postgraduate School. In 1996 Kelly was selected as an astronaut, and he has spent more than 50 days in space, traveling more than 20 million miles. He retired from NASA in 2011 after commanding Space..