Originally from Cincinnati, he now lives in Wales and has held academic posts at Cardiff and more recently Bangor University, where he is currently (2015) a professor in the School of Welsh and deputy vice chancellor of the university[1] He was a founding member of the pressure group Cymuned[2] and is former editor of the Academi's literary periodical Taliesin.
Llwch Cenhedloedd, (Gwasg Carreg Gwalch, 2003), which writes the history of the American Civil War based on Welsh-language evidence (mainly letters and other material written and published in Welsh on both sides of the Atlantic), won the Wales Book of the Year award in 2004.
He has also published a book on the prominent Welsh American anti-slavery campaigner, Robert Everett: I Ddeffro Ysbryd y Wlad (Gwasg Carreg Gwalch, 2007), again drawing on a wealth of Welsh-language evidence mainly unused by historians.
[1] His interest in the Welsh-language history of his native United States has also led to the publication of an English-language volume Welsh Writing from the American Civil War: Sons of Arthur, Children of Lincoln (University of Wales Press, 2007).
He is also a fiction writer, having published a children's book, Ceffylau'r Cymylau (Gwasg Gomer, 2010), and four adult novels.