Ph.D. in History and Civilization, European University Institute; Florence, Italy.
Laurea in Early Modern History from the University of Florence. Author of the books Tra religione e magia. Storia del prete modenese Guglielmo Campana (1460?-1541), (Firenze, Olschki, 1999), and Under the Devil’s Spell. Witches, Sorcerers, and the Inquisition in Renaissance Italy, published by Syracuse University in Florence in the Villa Rossa Series in 2007.
Organized, with Dinora Corsi (University of Florence) the international conference "Thou Shalt not Suffer a Witch to Live. Witches in Treatises and Trials (XIV-XVII centuries)", held at Syracuse University in Florence and at the University of Florence (Oct. 20-21, 2006). Co-edited the proceedings, which were published as Non lasciar vivere la malefica. Le streghe nei trattati e nei processi (secc. XIV-XVII) by Firenze University Press in 2008.
Co-edited (with Mario Biagioni and Lucia Felici) the volume Fratelli d’Italia. Riformatori italiani del Cinquecento (Torino, Claudiana, 2011).
Other publications include articles in scholarly journals such as Italian History and Culture, Archivio Storico Italiano, and the Mélanges de l'École française de Rome, for major reference works such as The Encyclopedia of Witchcraft: The Western Tradition (Santa Barbara, CA, ABC-Clio, 2006) and Dizionario storico dell’Inquisizione (Pisa, Edizioni della Normale, 2011), as well as for collective volumes such as Per il Cinquecento religioso in Italia (2003); I Vincoli della natura: magia e stregoneria nel Rinascimento (2012).
Has been awarded grants from the Italian Ministry for Foreign Affairs, the École Française de Rome, the University of Florence, and from Harvard University Center for Italian Renaissance Studies at Villa I Tatti.
He is part of the editorial committee of the series "Studi e testi per la storia religiosa del Cinquecento" published by L. S. Olsckhi.
Teaches undergraduate and graduate courses in Italian Renaissance history and the history of witchcraft. Prof. Duni is currently working on a survey book of witchcraft and witch-hunting in Italy from the Middle Ages to the Eighteen century.