Maggie Phillips, Ph.D, is one of the most appreciated experts and trainers of dissociation disorder treatment. She is experienced psychotherapist and hypnotherapist and she has developed the four level model for treatment of dissociation disorder. Dr Phillips is the author of many articles and she has written a book about treatment of dissociation disorder.

(Phillips, Maggie & Frederick, Claire (1995): Healing the Divided Self: Clinical and Ericksonian Hypnotherapy for Post-Traumatic and Dissociative Conditions (Norton Professional Book)