Dr. Masatoshi (Toshi) Hirabayashi bridges planetary science mission technologies and planetary science to harmonize them on planetary science exploration missions. His expertise is in space operations, particularly exploring techniques to achieve both engineering and science requirements under mission constraints. His engineering targets are orbiter/lander design and navigation techniques enabling scientific infestations, while his scientific focuses are on the origin and evolution of small bodies, moons, and terrestrial bodies to explore planetary volatiles.