 He is currently a senior staff member, emeritus, at CERN.In 1971–1975, Sergio Ferrara did pioneering work on Conformal Field Theory and the Conformal bootstrap.In a series of papers written in collaboration with , Aurelio Grillo and Giorgio Parisi, he studied constraints imposed by conformal symmetry on the operator dimensions, the form of the correlation functions, the operator product expansion, and the conformal partial wave expansion for the four-point correlation functions of the theory.