About Christopher Cassidy
Christopher John Cassidy is an American retired NASA astronaut and United States Navy SEAL. He achieved the rank of captain in the U.S. Navy. His first spaceflight was on a Space Shuttle mission in 2009. He was the Chief of the Astronaut Office at NASA from July 2015 until June 2017. On July 22, 2009, Cassidy stepped outside the ISS with NASA astronaut David Wolf for his first spacewalk. On July 31, 2009, Cassidy returned to the KSC Shuttle Landing Facility, wrapping up his first spaceflight after 15 days in space.
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