Born in Hokkaido, Mohri earned degrees in chemistryand a Doctorate from Flinders University in South Australia in 1976.
Most of Mohri's work has been in the field of materials and vacuum sciences. From 1975 to 1985, Mohri was a member of the nuclear engineering faculty of Hokkaido University, where he worked on nuclear fusion related projects.
Mohri was selected to train as a payload specialistfor a Japanese materials science payload. He flew his first space mission aboard STS-47in 1992 as chief payload specialist for Spacelab-J. Mohri subsequently made another trip into space as part of mission STS-99 in 2000.