Her biography, Sophia of Hanover: from Winter Princess to Heiress of Great Britain, 1630-1714 was published in 2010 by Peter Owen Publishers, London. It was Majesty Magazine's Book of the Month upon release. Having long been fascinated by the subject, she translated a considerable proportion of the Electress Sophia's writings from the original French and German, to reveal "a remarkable portrait of a remarkable woman."

She is also the author of John Toland: Ireland's Forgotten Philosopher, Scholar ... and Heretic, also published in 2010. She came upon the name and reputation of Toland through her research for her biography of Sophia of Hanover:

"Searching through other people’s bibliographies, I realised that he was the recognised source of information on the Courts of Hanover and Berlin in the first decade of the Eighteenth Century, and Chambers Biographical Dictionary informed me that he was an Irishman."

She has been involved, in an editorial capacity, in the re-issuing of several important works of the Irish philosopher, John Toland (1670-1722). This includes his 1714 pamphlet, Reasons for Naturalizing the Jews in Great Britain and Ireland, which has been published in print and e-book editions. An Account of the Courts of Prussia and Hanover was first published in 1705 and is also available in a modern edition, in both print and e-book formats.

J.N. Duggan was born in Sheffield, England in 1938 but came to live in Ireland at the age of 12. She returned to Sheffield to train as a nurse and later completed a BSc at University College Dublin. She now lives in Galway.

Books by J.N. Duggan are published by Peter Owen Publishers and The Manuscript Publisher.

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