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One of his finest must be on enclosed settlement sites in the British Archaeological Reports Landscape Archaeology volume; another, on the evidence from aerial photography of monastic proto-towns in the Clarke-Simms BAR volume on urban origins. The paper on the evidence of aerial photography at Tara and the paper ‘Kells and its Book’ are also very important. Most recently his Lehaunstown and Ushers Quay papers were widely welcomed.
He was most at home with the Southern Ui Neill in the north midlands. If time and technology could ever have been conflated, Leo should have been their air squadron commander. His unfinished doctorate sought to equate settlement forms and their distributions to historically documented dynastic fortunes. He produced an overview of the ecclesiastical of Westmeath for the F.X Martin Fetschrift., but it was probably his papers on the Kilpatrick excavations in the same county that gave him most personal satisfaction. The fine metalwork from the site appeared in the proceedings of an international symposium on early medieval art in Ireland and Britain, and the bone, antler and iron workings in Riocht na Midhe, a journal that had earlier carried his interim report on the same excavations. He also inter alia, contributed to Archaeology Ireland. And wrote a chapter for Illustrated Archaeology of Ireland and he edited Here Lyeth, a study of early church sites in north Dublin.