He served as President of the Italian Association of Constitutional Law Scholars in 2015-2018 and as President of the Gruppo di Pisa Association for the study of constitutional justice in 2008-2010.
He has been a member of the High Council of the Bank of Italy.
He has also been a member of various committees, including the Government Commission for Constitutional Reforms (established in 2013), the Commission entrusted with drafting a judicial reform proposal (established in 2015), the Joint Committee for the Implementation Rules of the Special Statute of Friuli Venezia-Giulia Autonomous Region, and the Commission for devising measures for the judicial reform (established in 2021).
He has been a practicing lawyer.
He has authored over 450 scholarly works and published, among others, the following volumes: La produzione economica privata nel sistema costituzionale, Padua, Cedam, 1983; Le decisioni processuali e la logica del giudizio costituzionale incidentale, Padua, Cedam, 1984; Il voto e la democrazia, Rome, Editori Riuniti, 1991; “Articolo 75 – Il referendum abrogativo”, in Commentary on the Constitution, edited by G. Branca and A. Pizzorusso, Bologna – Rome, Zanichelli – Il Foro Italiano, 2005; Lo sguardo profondo. Leopardi, la politica, l’Italia, Modena, Mucchi, 2017; Costituzione italiana: articolo 12, Rome, Carocci, 2018; and Ogni cosa al suo posto. Restaurare l’ordine costituzionale dei poteri, Milan, Giuffrè Francis Lefebvre, 2023.