a member of the O'Donnell Clan Association. He was very active in O'Donnell Clan research for many decades, and at one time represented the Irish Defence Forces and the Military History Society in these matters. He frequently corresponded also with the Spanish and Austrian members of the clan of the O'Donnells of Tyrconnell. Of note, he also wrote a published series on the history of military barracks in Ireland, and lectured at the Old Dublin Society. He also researched Theobald Wolfe Tone's death, discovered his tomb, and published several articles on evidence that it was an assassination rather than suicide. In 1980, he also published the first Map of the War of Independence, showing ambushes, raids, burnings and other incidents in the early 1920s. He wrote several series on topics of American military history. Some of his written material on military technology has been used for instructional purposes at the US Armed Forces Staff College in Norfolk, Virginia. In December 1994, he presented his military memorabilia and artefacts to the National Museum of Ireland. (Evening Press, 20 December 1994) He also wrote on Irish non-military history including legends of famous castles such as Castlemartin and Ballyheigue, where a tale of a ghostly appearance was picked up later by the American expert on the paranormal, Hans Holzer, in his book The Lively Ghosts of Ireland. He was best known abroad for his book The Irish Faction Fighters of the 19th Century, (published by Anvil Books, Dublin, 1975), a sociological analysis of rural inter-clan feuding, and its exploitation as a form of control to contain rising agrarian agitation in the 19th century in Ireland. He was frequently consulted as an authority on various historical matters, and was often cited at home and abroad in other works. He wrote over 1,000 articles and was a frequent contributor to leading Irish newspapers and periodicals, including An Cosantóir, the journal of the Irish Army, and The Irish Sword, the journal of the Irish Military History Society. He was a member of many associations (PEN/writers, Public Relations Institute of Ireland, the US President John F. Kennedy Association). He also held the position of Hereditary Lord Steward for Tyrconnell, with prerogatives as deputy to the Lord High Steward of Ireland (Great Seneschal of Ireland) and also succeeded to an Irish territorial barony, Fingal originally dating back to a grant by King John in 1208 and a related