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Dr Murphy is a graduate of University College, Dublin (BA, MLitt) and Trinity College, Dublin (PhD). He has taught at both of these institutions, teaching electives on European and Irish history as well as military history and the history of polar exploration. Between 1997 and 2005 he was a major contributor to the Royal Irish Academy’s Dictionary of Irish Biography, writing almost 400 biographical entries. During this period working for the Royal Irish Academy, he was also seconded to the Irish Manuscripts Commission. In 2004 he became the first Irish scholar to be awarded a fellowship to the West Point Summer Seminar in Military History. He is a member of various societies including the T.E. Lawrence Society and the Ormonde Military History Society. Since 2008, he has acted as a reader for academic publishers, including Four Courts Press, Palgrave-MacMillan, Yale UK and Liverpool University Press. He is a member of the Royal United Services Institute and is an external examiner for Department of Defence Studies, King's College, London.