Dr. Keiichi OKAI is currently an Associate Senior Researcher of Japan Aerospace Exploration Agency. He graduated from the University of Tokyo, Department of Aeronautics and Astronautics, School of Engineering, B.E. (1996), M.E. (1998) and Dr. Eng (2001). He joined the National Aerospace Laboratory of Japan (now JAXA) in 2001. October 2006-September 2007, he was a visiting scientist at DLR (German Aerospace Center), Cologne, Germany. March 2013-March 2016, he was a Project Associate Professor at the University of Tokyo (temporally transfer).