Dr. Lettieri received his Ph.D. from the University of Southern California. He has completed postdoctoral certifications in psychoanalysis, neuropsychology and mental disability law.
Dr. Lettieri is a member of the Expert Witness Panels of Orange County and San Bernardino County Superior Courts. Whether privately retained or appointed by the court, he is frequently called upon to assess individuals for a number of reasons, including competency to stand trial and insanity, and to evaluate individuals accused of sex crimes and violent offenses. He conducts forensic neuropsychological evaluations, both criminal and civil.