For his graduate study, he chose University of Oxford. There, he worked with Phil Charles, Robin Corbet and Alan Smale, among others, on interacing binaries, completing his D.Phil thesis on AM Her type systems in under 3 years and 1 month. He then spent 3 years at Mullard Space Science Laboratory, and worked with Keith Mason, Alan Smale, Simon Rosen and Coel Hellier. During his 6 years in England, he was mostly an optical astronomer, and had 6 observing trips to La Palma, 3 to South Africa, 2 to Australia, and 1 to Hawaii, using world-class telescopes with state-of-the-art instruments located at the best sites in the world.
Koji then decided to move to the United States, and spent 2 years at UC Berkeley's Center for EUV Astrophysics. He worked on the preparations for the EUVE all-sky survey. CEA turned out not to be a productive research environment for Koji.
Koji joined NASA Goddard Space Flight Center as an USRA research scientist in January 1992. His work initially was on the Japanese-US ASCA mission. More recently he has worked on the ill-fated ASTRO-E mission, and now the Astro-E2 mission. In recent years, Koji has focust his research efforts into the X-ray observations of magnetic cataclysmic variables and other accreting binaries.
Koji is a permanent resident of the US, although his nationality is still Japanese.
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