The Standard Edition of The Ancient Celtic Ancestry of the O'Brien Family: Their Pre-Surname Genealogies, History, Myth and Law (Paperback) (ISBN-13: 9781482633672)

His coursework at Yale, Harvard, and the University of Wales Trinity Saint David to date has included Celtic linguistics, archaeology of the Western world and the Middle East, Old Irish, Minoan & Mycenaean archaeology, Modern Irish, the Indo-European expansion and its mythology, Celtic mythology, classical civilization including Greek and Roman religion and Homeric epic, Early Irish Historical Tales, historical research methods, the Celtic Arthur, early Celtic Christianity, the medieval Irish church, and the early modern history of England and Celtic Cornwall, Wales, Scotland, and Ireland.

He taught Irish on behalf of The Irish Arts Center in New York from 1979 to 1981; plus mythology and Seanchas through the medium of the Irish Language at Scoil Ghaeilge Ghearóid Tóibín / The Gerry Tobin Irish Language School from 1989 to 2007; and Irish and Irish Gaelic culture at Fordham from 2008 to 2010.

He currently serves on the Advisory Board for the Irish Institute of Molloy College, teaches Irish on behalf of Cumann Carad na Gaeilge / The Philo-Celtic Society (www.philo-celtic.com), writes the Seanchas column for the Irish Language magazine AN GAEL, and is a member of the American Conference for Irish Studies and the American Irish Teachers Association.

He is also the author of a number of books and articles in Irish and in English including "Before the Kilt: How the Irish and Scots Dressed in the 16th Century" (Druid Press, 2011) and "An Chopail in Abairtí Aicme" (Druid Press, 2012).