Mathematician. He entered the Mathematics Department of the Faculty of Science of the Imperial University of Tokyo in 1894 and after graduation in 1897 proceeded to graduate school. He studied in Germany in 1898 under David Hilbert and aimed for further research on algebra and algebraic number theory. Upon returning to Japan, he was appointed as a professor at the Imperial University of Tokyo in 1904. He presented his research, “Upon theory of abelian variety” (Takagi existence theorem), at the International Congress of Mathematicians in Strasbourg in 1920 and gained international recognition. Member of the selection committee for the Fields Medal in 1932. Awarded the Order of Culture in 1930. Member of the Japan Academy.