Born in San Germano Chisone (Italy) in 1943, has been a judge and president of the Italian Constitutional Court. Professor of Constitutional Law at the University of Turin, among his works include Constitutional Justice (1977), Constitutional Law (1984) and published in the same Editorial, The demand for justice (with Carlo Maria Martini) (2006), Principles and helpful. The Constitutional Court and Politics (2008), Ductile law. Law, rights, justice (102011), History and Constitution (22011) yContra ethics of truth (2011).