He is a graduate of University College Dublin and Columbia University and has published widely on many aspects of Irish, US, and Jewish economic history. He is the author of Ireland: A New Economic History (Oxford UP 1994), Black ’47 and Beyond (Princeton UP 1999), Jewish Ireland in the Age of Joyce (Princeton UP 1999) and has also edited or co-edited several books, including Famine Demography (with Tim Dyson, Oxford UP, 2002) and When the Potato Failed (with Richard Paping and Eric Vanhaute, Brepols 2007). He has just completed a global history of famine (forthcoming from Princeton UP). He has also published widely in leading economics, economic history, and demography journals. He has served on the editorial board of several professional journals, and is currently co-editor of the European Review of Economic History.