Armand Borel, 1923-2003, mathematician. Born in La Chaux-de-Fonds, studied mathematics at the Federal Institute of Technology in Zurich. Spent 1949-50 in Paris where he came into contact with leading French mathematicians who exercised an important influence on this thinking. In 1952 he went to Princeton, having been invited to the Institute for Advanced Study there. In 1954 he moved on to Chicago, returning to Switzerland to take up an appointment as professor of Mathematics at the Federal Institute of Techology in Zurich. Princeton then offered him a prestigious permanent professorship which he took up in 1957, where he remained until 1993. For three years 1983-6 he held concurrently a professorship in Zurich. He divided the last years of his life between the US, the Far East and Switzerland, and died in Princeton. He received a number of honors, including the Balzan Prize in 1992.