kohei saito (born 31 january 1987) is a japanese philosopher and researcher. he studies the history of economics. he is especially interested in karl marx and his philosophy and economics. he is an associate professor at the graduate school of arts and sciences, university of tokyo. he was one of the winners of 17th japan society for the promotion of science (jsps) prize for 2020. he won the award for his work on "an ecological turn in marxian economics."