Emmy van Deurzen is a philosopher, counselling psychologist and existential psychotherapist. She is Principal of the New School of Psychotherapy and Counselling at the Existential Academy in London, UK.

Erik Craig is an existential psychologist, author, and independent scholar. While living and practicing in Santa Fe, New Mexico, he also teaches and trains psychotherapists internationally.

Alfried Längle has a private practice in psychotherapy, general medicine and clinical psychology and is Professor of Applied Psychology at HSE-University, Moscow and Sigmund Freud University, Vienna.

Kirk J. Schneider is a psychologist and leading spokesperson for contemporary existential-humanistic psychology. He is an adjunct faculty member at Saybrook University and Teachers College, Columbia University.

Digby Tantam is Emeritus Professor of Psychiatry at the University of Sheffield and Visiting Professor at Middlesex University and the New School of Psychotherapy and Counselling.

Simon du Plock is Head of the Faculty of Post-Qualification and Professional Doctorates at the Metanoia Institute, London, and Professor at Middlesex University, UK.