His studies and works are focused mainly on the subject of famine (Irish famine in the late 1840’s) and of fluctuations in the Irish population.
He is a member of the Cliometric Society, the Economic History Society, the European Historical Economics Society, the Irish Economic and Social History Society and of the Royal Irish Academy. He is co-editor of the European Review of Economic History and in 2010 was awarded the Royal Irish Academy Gold Medal
- Among his most relevant publications are:
▪ O’Grada, C.; (2009) Famine: A Short History. Princeton: Princeton University Press
▪ Ó Gráda, Cormac; (2006) Ireland’s Great Famine: Interdisciplinary Perspectives. Dublin: UCD Press
▪ O’Grada, C.; (2006) Jewish Ireland in the Age of Joyce: A Social Science History. Princeton: Princeton University Press
▪ Edited with (with Tim Dyson, London School of Economics); (2002) Famine Demography: Evidence from the Past and the Present. : Oxford University Press