Mathematician. His most important contribution came in 1920 when he introduced the Takagi class-field theory. It subsequently became the framework of algebraic number theory. The German mathematician Hasse included Takagi’s theory in his treatise on class field theory a few years later. For his career work, Takagi received many honors, including from Czechoslovakia, the University of Oslo, and the National Research Council of Japan. In 1932 he was appointed Vice-President of the International Congress of Mathematicians at Zurich. He served on the committee to award the first Fields’ Medals for the 1936 Congress. Takagi retired that year, but continued publishing books and papers. His two most important books from this time are “Introduction to Analysis” (1938), “Algebraic Number Theory” (1948) and an important work on the history of mathematics in the 19th century. (bio by: Warrick L. Barrett)