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Dr. Dewey Ertz
Dr. Dewey Ertz
Dr. Dewey Ertz

Dr. Dewey Ertz is a member of the Cheyenne River Sioux Tribe in South Dakota and a practicing psychologist at Rapid City, South Dakota. His practice includes providing evidence-based intervention techniques and cognitive-behavioral methods to a wide variety of patients including children, adolescents, adults, and the elderly. Dr. Ertz has been in clinical practice at the doctoral level since 1977 and he began working in the mental-health field during 1974. He has worked in a private residential Indian school and in community mental health for the Cheyenne River Sioux Tribe, he is the chairperson for the Great Plains Area IRB and he is a member of the national IHS IRB. Dr. Ertz completes forensic evaluations in several areas, he provides psycho-sexual assessments and treatment to sex offenders, and he routinely sees patients for trauma assessment and treatment.

His practice activities are focused on various conditions including mood disorders, disruptive behavioral disorders in childhood and adolescence, and treating dual diagnosis patients who present both substance use and emotional problems. Dr. Ertz has been involved with the assessment and treatment of post-trauma disorders since he began his career in 1974. He provides training to various organizations, schools, and treatment providers who are identifying, assessing or treating psychological trauma survivors. A central feature of this treatment is understanding the core issue of trauma and how survivors utilize various inappropriate coping methods which only increases their trauma experiences and leads to re-victimization and/or victimizing others.