The early 2000s came with "Antoinio Citterio Patricia Veil", a studio for architecture and interior design, which he founded alongside Patricia Veil. This served as a practice for developing international complex long-term projects, at all scales and in synergy with a qualified network of specialist consultants. Today, this has expanded into numerous foreign and Italian companies.

Since the 1990s at the latest, the successful architect has also been one of the most internationally sought-after designers, as is clear from the portfolio of renowned companies for which he works: world leading design brands such as Vitra and B&B Italia (furniture), Arclinea (kitchens) and Hansgrohe (bathrooms), all successfully implement his ideas. However, project developers and hotel chains also benefit from the Milan-based designer's esprit and design ideas. Citterio's CV is adorned with luxury lodgings for the prestigious Bulgari hotel chain, a luxury spa in Moscow and the title 'Royal Designer', which has been awarded to him by the British Royal Society.

In 1987 and in 1994 he was awarded the Compasso d’Oro-ADI. From 2006 to 2016 he has been professor of Architectural Design at the Mendrisio Academy of Architecture (Switzerland). In 2008 he was honoured by the Royal Society for the Encouragement of Arts, Manufactures & Commerce of London, which gave him the title of “Royal Designer for Industry”.

Antonio Citterio is art director of Maxalto, Arclinea and Azucena.