René van Hezewijk began his studies at the University of Utrecht and eventually became Associate Professor. He then moved to the Dutch Open University as Professor and Dean of the Faculty of Psychology. He has published extensively on theoretical and historical topics in psychology and has had a long-standing interest in the “Utrecht School” of phenomenological psychology that flourished in the mid-twentieth century. He was the editor of Nederlands Tijdschrift voor de Psychologie for 14 years, and former Treasurer and President of the International Society for Theoretical Psychology.   Henderikus Stam is a Professor Emeritus of Psychology and a former Adjunct Professor in the Department of History at the University of Calgary, Calgary, Canada. His recent work has focused on contemporary theoretical problems in psychology and the historical foundations of 20th-century psychology. He was the founding editor of Theory & Psychology, which he edited for 26 years. He is a founding member and former President of the International Society for Theoretical Psychology; a former President of Division 24 of the American Psychological Association (Society for Theoretical and Philosophical Psychology) as well as Division 26 (Society for the History of Psychology). In 2015 he was honored when the American Psychological Foundation presented him with the Joseph B. Gittler Award for his contributions to the philosophy of psychology