Dr O’Halloran’s research focuses on organisational and clinical pathways for those with chronic diseases, or at the end of life; producing models of good practice for the implementation of complex interventions.

Projects include an all-Ireland realist evaluation of transition to adult services for young people with life-limiting conditions; a realist evaluation of the Liverpool Care Pathway for the dying patient; and a feasibility study for a randomised controlled trial of advance care planning with older patients who have renal failure.