Dr. Roger Di Pietro, Psy.D. is clinical psychologist in private practice who has authored Early Recollections: Interpretative Method and Application (with Dr. Harold H. Mosak), The Depression Code: Deciphering the Purposes of Neurotic Depression, The Anxiety Code: Deciphering the Purposes of Neurotic Anxiety, the Decoding Persistent Depression series, and Anger: Psychological Reasons Why It Rises and How to Reduce it.