Adam Crabtree is a historian of hypnosis, dissociation, and psychodynamic psychotherapy and has written a number of books in these areas. In conjunction with Sarah Osei-Bonsu, he has also translated from French L'automatisme psychologique by Pierre Janet, published in English by Routledge. He teaches at the Centre for Training in Psychotherapy, Toronto, and has a private psychotherapy practice.

Sarah Osei-Bonsu is a translator with an interest in psychotherapy and the role of the unconscious mind. She most recently collaborated on the translation of Pierre Janet's L'automatisme psychologique with Adam Crabtree. As a translator, she is committed to maintaining the integrity of the author's voice while illuminating the overall meaning in translation.