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What Dr McKenzie has uncovered is very unique to the field of psychiatry, and possibly represents one of the greatest breakthroughs, if not the greatest breakthrough, in the second half of the 20th Century.
- Lance S. Wright, M.D., Psychoanalyst

Evidence of early traumatic origin may soon be recognized as one of the most important research findings in decades.
- Gordon and Breach

Dr. McKenzie’s new book is a rare example of careful conceptual reasoning about basic categories in medicine. Ultimately this is what is sorely needed in rational thinking about the mysteries of mental illness. - - - Raymond Moody
Author, Life after Life
MD, PsyD, PhD philosophy

I endorse broader considerations in psychiatry, such as Dr. McKenzie proposes.
- John F. Nash, Jr., Nobel Laureate

Dr. McKenzie’s book is revolutionary. Some long sought answers to causes of psychosis and other severe mental illnesses are explained in clear and understandable language.
- Harold Stern, PhD, Psychoanalyst

Old theories of modern science literally melt away before the riveting and crystal clear logic that erases any thought of current hypotheses.
- Dr. Stephen Levin, Scientist, Author

This book is rich in new ideas that are a further development of the enlightening, stimulative and provocative ideas described in his earlier book with Lance S. Wright, MD: Delayed Posttraumatic Stress Disorders from Infancy: The Two Trauma Mechanism. I have used this latter book in my courses at Georgetown University and I plan to continue to use the ideas of Dr. McKenzie in my classes. No one will regret reading this book.

Wilfried Ver Eecke, Professor in Philosophy Adjunct Professor in Psychology Georgetown University