Dr. Dermot Barnes-Holmes is foundation Professor of Psychology at the National University of Ireland, Maynooth, and served as the Head of Department of Psychology from 1999 to 2008. He studied under Professor Julian Leslie at the University of Ulster before taking up a teaching position at University College, Cork, where he founded the Behaviour Analysis and Cognitive Science Research Unit. After nine years at UCC he was appointed to his current post. Dr. Barnes-Holmes has published over 200 scientific articles, book chapters, and books, and he was recently ranked as the most prolific author in the world in the Experimental Analysis of Human Behavior during the period 1980 to 1999 (Dymond, 2002). He has served on, or is currently serving on, the editorial boards of the following journals: Experimental Analysis of Human Behavior Bulletin; Journal of the Experimental Analysis of Behavior; Journal of Applied Behavior Analysis; The Behavior Analyst; The European Journal of Behavior Analysis; The European Journal of Psychology; The International Journal of Psychology and Psychological Therapy (Associate Editor); and The Psychological Record. Dr. Barnes-Holmes has graduated 25 doctoral research students and has been directly involved in attracting over 1,000,000 euro in competitive research funding. He served on the Health Research Board from 2002-2005 and was elected to the Council of the Psychological Society of Ireland from 2004-2007.