Professor Holloway studies ancient numismatics, ancient art, Bronze Age Italy, and the city of Rome.
Constantine and Rome, New Haven and London, 2004.
Ustica , The Results of the Excavations of the Regione Siciliana, Soprintendenza ai Beni Culturali ed Ambientali, Provincia di Palermo in collaboration with Brown University, with Susan S. Lukesh, Providence and Louvain, vol. 1, 1995, vol. 2, 2000.
The Archaeology of Early Rome and Latium, London, 1994.
The Archaeology of Ancient Sicily, London, 1991.
Buccino, The Eneolithic Necropolis of San Antonio and Other Prehistoric Discoveries made by Brown University in 1968 and 1969, Rome, 1973.
Satrianum, the Archaeological Investigations Conducted by Brown University in 1966 and 1967, Providence, 1970.
Gold Medal of the Archaeological Institute of America, LHD honoris causa (Amherst College), Doctor Philosophiae et Litterarum honoris causa (Catholic University of Louvain, Belgium), Corresponding Member of the German Archaeological Institute, Honorary Member of the Royal Belgian Numismatic Society, Fellow of the Royal Numismatic Society (London), Fellow of the American Academy in Rome, Foreign Member of the Italian Institute of Prehistoric and Protohistoric Studies (Florence), Foreign Member of the National Institute of Italic and Etruscan Studies (Florence).