Sergio Sartorelli's career at
Ghia rose quickly when in 1957, engineer
Savonuzzi left Ghia for
Chrysler, Sartorelli became Head of the Style Prototypes. After the sudden death of
Luigi Segre, owner and chief stylist of Carrozzeria Ghia, Sartorelli left Ghia.
Officine Stampaggi Industriali (OSI) was set up as a parallel and complementary company to Ghia and it was part owned by Luigi Segre. With the death of Segre the partnership disappeared and OSI was left with no styling department. After two years of a freelance relationship with
Michelotti, OSI set up its own styling department called Centro Stile e Esperienze OSI, and appointed Sergio Sartorelli as its director. This arrangement lasted from 1965 until December 1967 when OSI reorganized. In 1968 what was left of Centro Stile e Esperienze OSI, became the Future Studies department at Centro Stile Fiat with Sergio Sartorelli as its head, it was entrusted with the study of design, automotive development, and modeling of prototypes for
Fiat. By 1984 with the car market in crisis, Fiat let Sergio Sartorelli go, and he retired from his design career. == Design work==