Tadatoshi Akiba (秋葉 忠利 Akiba Tadatoshi, born November 3, 1942) is mayor of the city of Hiroshima, Japan.
He studied mathematics at the University of Tokyo, receiving a B.S. in 1966 and an M.S. in 1968. He continued his studies under John Milnor at the Massachusetts Institute of Technology, earning his Ph.D. in mathematics in 1970. He took teaching jobs at a series of universities: Stony Brook (1970), Tufts University (1976), and Hiroshima Shudo University (1986–1997). His research was on topology, with an interest in homotopy groups.
As a member of the Social Democratic Party, he was elected to the House of Representatives, and served from 1990 to 1999. He assumed office as mayor of Hiroshima in February, 1999, and was reelected to this position in 2003.
As mayor, he has been a visible peace activist. He is active in the Mayors for Peace organization, serving as the president of their World Conference. He has also been an advocate of the abolition of nuclear weapons, and a vocal critic of George W. Bush.
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