You can read about some of what I have written here: www.amazon.com/John-Moorhead. Some important publications in shorter format are:
‘The Byzantines and the West in the sixth century’ and ‘Ostrogothic Italy and the Lombard invasions’ in The New Cambridge Medieval History c.500-c.700 1 ed. Paul Fouracre (Cambridge, 2005), pp. 118-140, 139-161; the former reprinted, lightly revised, as ‘Western approaches’ in The Cambridge History of the Byzantine Empire c.500-1492 ed. Jonathan Shepard (Cambridge, 2008), pp. 196-220.
‘Boethius’ life and the world of late antique philosophy’ in The Cambridge Companion to Boethius ed. John Marenbon (Cambridge, 2009), pp. 13-33.
‘Bede on the papacy’ Journal of Ecclesiastical History 60 2009 217-32
‘Chrétiens et musulmans: l’ouverture d’un débat’ in Histoire générale du christianisme 1 ed. J. Armogathe et al. (Paris, 2010) pp. 881-890
‘What Names did the anti-Nicenes use for Catholics and Arians?’ Augustinianum 50 2010 423-441
‘Where did the Jews come from? A Review Essay’ Australian Journal of Politics and History 57 2011 115-122 (on Shlomo Sand, The Invention of the Jewish People)
“Some Conflicts between Christians and Jews in the sixth century’ Studi medievali 52 2011 665-680
The Roman Empire Divided 2nd edn London: Pearson, 2013 (actually October 2012), 356 pages
‘Goths and Vandals, Migration History’, in Encyclopedia of Global Human Migration Malden MA: Wiley 2013
‘Gregory’s Literary Inheritance’, in A Companion to Gregory the Great ed. B. Neil and M. Dal Santo (Leiden, 2013) 249-67
The Popes and the Church of Rome in Late Antiquity London and New York: Routledge 2015, 321 pages
‘The Making and Qualities of Ostrogothic Kings in the Decade after Theoderic’, in Verena Epp and Christoph H. F. Meyer ed. Recht und Konsens im fruhen Mittelalter Ostfilden 2017 129-49
‘Boethius’, in Andrew Pinsent ed. The History of Evil in the Medieval Age 450-1450 CE London and New York: Routledge 2018 23-35