Behnken served as Joint Operations Commander on the first crewed flight of the SpaceX Crew Dragon, the Demo-2 mission, launching May 20 and landing in Pensacola, Florida on August 2, 2020. He also served as Flight Engineer on the International Space Station for Expedition 63. Behnken contributed to more than 110 hours of time to supporting the orbiting laboratory’s investigations. He participated in a number of scientific experiments, spacewalks and public engagement events during his 62 days aboard station. Behnken helped work on numerous sample switch outs for the Electrolysis Measurement (EM) experiment, as well as contributing images to the Crew Earth Observations (CEO) study.  While on board, Behnken conducted four spacewalks and is now tied for most spacewalks by an American astronaut with Michael Lopez-Alegria, Peggy Whitson, and Chris Cassidy, each of whom has completed 10 spacewalks.