 His first spaceflight was on Space Shuttle mission STS-127, and his second was as a flight engineer for Expedition 35/36, launched aboard Soyuz TMA-08M.He was in space July 15 to 31, 2009, and March 28 to September 10, 2013.Cassidy has worked as a CAPCOM for both International Space Station and Space Shuttle missions in the past.