Gavin Foster (PhD, University of Notre Dame, 2009) is an historian of modern Ireland whose work has focused on the interaction between republicanism, political violence, social conflict, social status, and popular culture in the Irish revolution, specifically its final civil war phase c. 1922-23.  He has just published  The Irish Civil War and Society: Politics, Class, and Conflict (Palgrave Macmillan, 2015):  http://www.palgrave.com/page/detail/the-irish-civil-war-and-society-gavin-m--foster/?sf1=barcode&st1=9781137425683.