Citterio graduated in architecture at the Politecnico di Milano and since 1972 has worked for many leading manufacturers such as Ansorg, B&B Italia, Flexform, Flos, Iittala, Hansgrohe, Inda, Sanitec Group, Kartell, Arclinea and Vitra.
The Mittelschüler-Kartell-Verband der katholischen farbentragenden Studentenkorporationen Österreichs or simply Mittelschüler-Kartellverband (MKV) is an Austrian umbrella organisation of Catholic male student fraternities (Studentenverbindung).
Among other, he worked for the following companies: Artemide, Cassina, De Padova, Flou, Fritz hansen, Kartell, Schiffini.