NAGOYA (Kyodo) Toshiyuki Toyoda, a nuclear scientist and professor emeritus at Nagoya University who fought for nuclear disarmament, died of multiple organ failure Friday at a Tokyo hospital, the school said. He was 89.

Toyoda was one of the main members of the Japanese group at the Pugwash Conferences on Science and World Affairs set up by scientists after Bertrand Russell and Albert Einstein warned the world in 1955 of the dangers of nuclear weapons following a U.S. hydrogen bomb test in the Pacific.

He was also involved in the Japanese version of the Pugwash conferences launched in Kyoto in 1962 and advocated nuclear disarmament throughout the Cold War.

Born in Gifu Prefecture, Toyoda studied nuclear physics at Tokyo Imperial University, the precursor to the University of Tokyo. He served as an assistant professor there before becoming a professor at Rikkyo University and later Nagoya University.

His written works included “SDI Hihan,” which criticized missile defense, and “Kakusenryaku no Ketsumatsu” (“The Results of Nuclear Strategy”), a critical examination of the superpowers’ nuclear strategies.

After retiring from Nagoya University, Toyoda served as head of the International Peace Research Institute at Meiji Gakuin University.

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