Prior to that, he was a visiting researcher at JPL from September-December, 2015. Koki received his Ph.D. from MIT, and his Master's and Bachelor's degrees from the University of Tokyo. Koki also has multiple flight project experiences including a small satellite Nano-JASMINE and a mercury spacecraft Bepi-Colombo. Koki's research interests include development of mathematical theories and their application to rigorous space mission analysis, design, and optimization.