She is most known for her influence in the use of plastics as a mainstream design material and her cofounding of Kartell, an Italian contemporary furniture company.

[1] During her studies, Ferrieri was influenced by Italian Rationalist architect Franco Albini,[2][3] whose work and theory focused on reduction, function, and rigorous beauty.

According to historian Catharine Rossi,[8] Ferrieri experienced problems in partnership due to her trouble in balancing her role as a wife and as an architect designer.

Anna Castelli Ferrieri laid the Kartell foundations on geometric shapes, bold color, and highly polished finishes.

[10] Ferrieri married Giulio Castelli and the couple led the way in Italian modern design with Kartell throughout the 60s, 70s and 80s.

[13] In addition to her work, she founded and was a member of several organizations including; The Movement of Architecture Studies (MAS) of Milan, 1945; National Institution of Urban Planning (NIU), 1952-1956 and later became president from 1969-1971; Italian Industrial Design Association (IDA) in 1956.

Ferrieri created more than 50 architectural projects, but some of her most famous and iconic works are as follow; the Kartell headquarters (with it being made from brilliant red blocks), a residential building on Via Marchiondi in Milan, and several offices and factories in Alfa Romeo.

[1] Although, according to biographer Cristina Morozzi, Gardella took the recognition for projects that Ferrieri worked on because he wanted to be the master of his own studio.

[9] During the 1950s through the 1960s, the theme of incompatibility of professional and familial life was a key issue discussed publicly through the newsletter, 8th Pax Romana.

By 1973, she was the president of this organization and presented “International and interdisciplinary action for the promotion of human rights and in particular the condition of women” [9] to the United Nations.

Coming from a family of community members, her father, Enzo Ferrieri, was a well-known journalist,[1] director, and critic of city's legendary Teatro del C'omegno; a highly regarded theater company.

She also took on a variety of commissions, including: “a sofa design for Arflex, a chair for Matteo Grassi, and flatware for Sambonet” [14] Ferrieri died on 22 June 2006.