Joseph Aguayo, PhD, is a training and supervising analyst at the Psychoanalytic Center of California and a guest member of the British Psychoanalytical Society. He holds PhDs in both Clinical Psychology and European History from UCLA. He contributes to leading psychoanalytic journals and has co-edited Wilfred Bion: Los Angeles Seminars and Supervision (2013) and authored Introducing the Clinical Work of Wilfred Bion (2023).

R.D. Hinshelwood is a fellow of the British Psychoanalytic Society and fellow of the Royal College of Psychiatrists; he has previously served as the clinical director at the Cassel Hospital, UK. Hinshelwood is the author of numerous publications, including Melanie Klein: The Basics (2017) and, recently, W.R. Bion as Clinician (2022).

Sira Dermen was a training and supervising analyst of the British Psychoanalytical Society. She was Honorary Senior Consultant at the Portman Clinic and was in full-time private practice. She has written on violence and perversion. She passed away in 2023.

Nicola Abel-Hirsch is a training and supervising analyst of the British Psychoanalytical Society and works in private practice in London. She is the author of numerous publications, including Bion: 365 Quotes (2019), and she is the editor of Hanna Segal's last book, Yesterday, Today and Tomorrow (2007).