1900 – 1945
Tosaka Jun (1900–1945) was a Japanese Marxist philosopher who trained under Nishida Kitarō but turned sharply against the idealist tendencies of the Kyoto School, developing a rigorous materialist critique of its foundational concepts. He was a founding member of the Materialism Study Group (Yuibutsuron Kenkyūkai) and argued that Kyoto School philosophy served ideological functions compatible with Japanese imperialism. Arrested for his leftist activities, he died in Nagano Prison in August 1945, days before Japan's surrender.
Founded the Materialism Study Group (Yuibutsuron Kenkyūkai) in 1932, Japan's leading Marxist philosophical organization
Developed a sustained materialist critique of Nishida Kitarō's 'pure experience' and place (basho) philosophy
Argued that Kyoto School idealism functioned as ideological cover for Japanese ultranationalism
Authored Nihon ideorogī ron (The Theory of Japanese Ideology, 1935), a landmark critical analysis
Died as a martyr of philosophical resistance, imprisoned by the Japanese state for his materialism and anti-imperialism