Academydd yn Ysgol y Gymraeg, Prifysgol Caerdydd yw Mac Giolla Chríost sydd wedi'i eni a'i fagu yn Iwerddon. Fe'i penodwyd fel darlithydd yn 2004 ac ers 2016 mae'n athro prifysgol yno ac yn aelod o Uned Ymchwil yr Ysgol ar Bolisi a Chynllunio Ieithyddol.
- "Implementing political agreement in Northern Ireland: Planning issues for Irish language policy", pp. 297–313, Social & Cultural Geography, 2001.
- "The Language Question", pp. 50–72, Irelands of the mind: memory and identity in modern Irish culture, ed. Allen and Regan, 2008
- "Linguistic Diversity and the City: Some Reflections, and a Research Agenda", pp. 1–11, International Planning Studies 13, 2008.
- "Irish gets out of jail", pp. 22–23, The Linguist 47, 2008.
- "A language of our own", pp. 12–13, Journal of the Royal Over-Seas League, 2008.
- "The origins of "the Jailtacht", pp. 317–336, Proceedings of the Harvard Celtic Colloquium 27, 2010
- Language, identity and conflict: a comparative study of language in ethnic conflict in Europe and Eurasia, Routledge, London, 2003.
- The Irish language in Ireland: from Goídel to globalisation, Routledge, London, 2005.
- Language and the city. Language and Globalization Palgrave Macmillan, Basingstoke, 2007.
- Jailtacht: the Irish language, symbolic power and political violence in Northern Ireland, 1972-2008, Cardiff, 2012.
- The Welsh Language Commissioner in context: roles, methods and relationships, Cardiff, 2012