 From 1969 he taught architectural and design subjects, first at the Politecnico di Torino, and then, from 1980 when he became an "ordinario" or full professor, at the Politecnico di Milano.Achille Castiglioni died on 2 December 2002 in Milan.The Castiglioni brothers designed the Lierna chair – an upright dining-chair in lacquered wood with a slightly padded plywood seat – for Cassina in 1960.