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Ian Stewart, PhD, is a faculty member in the School of Psychology at the National University of Ireland Galway. He has published over 80 peer-reviewed papers in the areas of Relational Frame Theory and derived relations and is a co-author and/or co-editor of several books including The Art and Science of Valuing in Psychotherapy, The Self and Perspective Taking and ACT and RFT in Relationships. He lives in Galway, Ireland.