David Dahl. His primary practice is as a Clinical Neuropsychologist, also practicing as a Psychologist: Addiction (Substance Use Disorder), a Psychologist: Cognitive & Behavioral, a Psychologist: Clinical, a Psychologist: Family, a Psychologist: Rehabilitation, a Psychologist, a Psychologist: Adult Development & Aging, a Psychologist: Clinical Child & Adolescent, and a Psychologist: Forensic.