He completed his general residency training in psychiatry at Duke University Medical Center, and his child/adolescent and forensic psychiatry residency training at Massachusetts General Hospital, Harvard Medical School. He is board certified by the American Board of Psychiatry and Neurology in general psychiatry and child and adolescent psychiatry. He is board eligible in forensic psychiatry. Dr. Soulier is appointed to the Sacramento County Criminal Expert and Juvenile Delinquency and Dependency Expert Panels. He has served as an expert witness in numerous adult, juvenile, family, and military cases regarding issues such as competency, criminal responsibility, sexual offenses, sexual abuse, memory, and custody. He has qualified as an expert witness for the United States Army. His areas of interest include custody, child abuse, and juvenile delinquency.