Church is an expert in Medieval History, specifically the 12th Century[4] and works at the University of East Anglia School of History department which he joined in 1995 after completing his postgraduate work in London. He is a Fellow of the Royal Historical Society[5] and the Society of Antiquaries of London.[6] He is also a trustee of the Allen Brown Memorial Trust, where he organises the R. Allen Brown Memorial Lecture that is given at the opening of the Battle Conference on Anglo-Norman Studies. The Trust also gives conference bursaries for postgraduate students and sponsors sessions at other conferences and a postgraduate reading group.[7][8]
Since 1994 he has written several articles (including for the journal History) and books on Medieval History, and is a regular conference organiser and speaker on the subject of King John.[9][10][11][12] Church has been regularly acknowledged as strong support to fellow Historians in their writing[13][14][15] and has lectured in Europe on the subject of the Plantagenet Empire.[16] In 2010 he co-lead with Professor Elisabeth Tyler (University of York) two reading groups which aimed to read Orderic Vitalis's Historica ecclesiastica from start to finish and reflect on its content.[17] In 2015 he appeared on Saturday Extra on Australian station ABC Radio with Nicholas Cowdery to discuss why does Magna Carta still matter,[18] and co-presented the BBC programme The Last Journey of the Magna Carta King, part of the BBC Taking Liberties season, with archaeologist Dr Ben Robinson.[19]
2007 – Dialogus de Scaccario, and Constitutio Domus Regis The Dialogue of the Exchequer, and The Disposition of the Royal Household (Oxford Medieval Texts)ISBN9780199258611
2001 – The Pakenham Cartulary for the Manor of Ixworth Thorpe, Suffolk, c.1250-c.1320 (17) (Suffolk Charters)ISBN9780851158358
2017 – Political Discourse at the Court of Henry II and the Making of the New Kingdom of Ireland: The Evidence of John’s Title dominus Hibernie – History pg.808–823 ISSN 0018-2648
2016 – Stephen: The Reign of Anarchy. By Carl Watkins. Penguin Monarchs Series. Allen Lane – History pg.772–773 ISSN 0018-2648
2010 – King John’s Testament and the Last Days of his Reign – English Historical Review pg.505–528 ISSN 1477-4534
2009 – The care of the royal tombs in English cathedrals in the nineteenth and twentieth centuries: the case of the effigy of King John at Worcester – The Antiquaries Journal ISSN 1758-5309
2008 – Paganism in conversion age Anglo Saxon England: the evidence of Bede's Ecclesiastical History reconsidered – History pg.162–180 ISSN 1468-229X
2007 – Aspects of the royal itinerary in twelfth-century England – Thirteenth Century England pg.31–45 ISSN 0269-6967
1995 – The rewards of royal service in the household of King John: a dissenting opinion – English Historical Review pg.277–302 ISSN 1477-4534
1994 – The earliest English muster roll, 18/19 December 1215 – Historical Research pg.1–17 ISSN 1468-2281