Medievalist; wrote one of the volumes in the series on the Duomo of Monreale, following the volumes by Ernst Kitzinger (q.v.) on the mosaics in the Cathedral and that by Roberto Salvini (q.v.) on the capitals in the Cloister.
The Cathedral of Monreale and Norman Architecture in Sicily. Palermo: S.F. Flaccovio, 1966.