Liam qualified from Trinity College, Dublin in 1995 and, after completing general practice training in the Scottish highlands and surviving some remote health care postings to Guyana and Ecuador, he returned to National University of Ireland, Galway. Here, he completed higher training in academic general practice and was then appointed lecturer in primary care in 2004 and senior lecturer in general practice in June 2010. He combines this with working as a GP principal in a single-handed rural practice in Ballyvaughan, Co Clare three days a week and is chairman of the North Clare Primary Care Team.
His primary research interests are Cardiovascular Multimorbidity and Connected Health in which he completed his MD. He is currently principal investigator on a Health Research Board study of cardiovascular multimorbidity in primary care as well as a €2.3 million EU study of telemedicine as part of the Northern Periphery Programme. Other research interests include falls prevention in the elderly, chronic kidney disease, hypertension, adherence to medication, and research capacity in primary care. He was appointed HRB Cochrane fellow in 2007 and is lead author of Cochrane systematic reviews in hypertension as well as adherence to cardiovascular medication for BMJ Clinical Evidence. He is also founding clinical director of the Western General Practice Research and Education Network (WREN).