What is the author's style in Uncommon Therapy: The Psychiatric Techniques of Milton H. Erickson, M.D. by Jay Haley?

Haley explains in the book that there are two entirely different attitudes towards the unconscious mind taken by psychologists. One warns that the unconscious is full of dangerous forces; the other assures people that the real unconscious mind harbors wonderful energies and memories. Hypnotists are one strain of psychology, represented by figures such as Mesmer. These are the people who had a greater tendency to think that the subconscious or unconscious mind is beneficial; whereas, Freudians tended to view it as harmful.