Research Experience
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2020.06-Now
The University of Tokyo, Emeritus Professor Emeritus Professor
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2018.04-Now
Waseda University Professor
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1999-2018.03
The University of Tokyo, Graduate School of Mathematical Sciences Professor
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1996-1999
Tohoku University, Graduate School of Sciences Professor
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1992-1996
Tohoku University, Mathematical Institute Associate Professor
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1989-1992
Tohoku University, Mathematical Institute Lecturer
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1988-1989
Princeton University Visiting Fellow
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1986-1989
Tohoku University, Mathematical Institute Assistant
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1985-1986
Waseda University, School of Education Assistant
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