Dermot Barnes-Holmes is a Professor of Psychology at Ulster University, Coleraine, Northern Ireland, UK. He previously held professorial chairs at Maynooth University in Ireland and Ghent University in Belgium. He is known internationally for developing relational frame theory (RFT) as a behavior-analytic account of human language and cognition. He has published 100s of research articles, book chapters, and books related to RFT, and behaviour analysis in general, and has been involved in attracting over 3.5 million euro in research funding since 2000.