He was a scribe, and book collector, as well as a member of the Ó Neachtáin literary circle in early 18th century Dublin. He amassed a huge library of Irish manuscripts, which included the Liber Flavus Fergusiorum, a medical text created by his ancestors in the 14th century.
- John Fergus MD: Eighteenth-century Doctor, Book Collector and Irish Scholar, by Diarmaid O Cathain, in Journal of the Royal Society of Antiquaries of Ireland, pp.139–163, volume 118, 1988.
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