Trained at the famed Milan Polytechnic Institute as an architect, Castelli Ferrieri began designing for Kartell in 1966, after being chosen as the architect for their headquarters. Famous for its critical role in the introduction of plastic as an acceptable material into the consumer market, Kartell was founded by Anna's husband-to-be, Guilio Castelli. Castelli Ferrieri became intrinsically linked to the company both as a designer as well as its Design Director, and instrumental in bringing such innovative designers to Kartell.