Brain Injury Rehabilitation Specialists
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Dr. David Demarest

Dr. Demarest is a clinical neuropsychologist with more than 25 years of extensive experience in the rehabilitation and neuropsychology field. As an Iowa- and Nebraska-licensed psychologist, Dr. Demarest has been involved in numerous neuropsychological studies that have helped advance the brain injury field. Highlights from Dr. Demarest's professional career include:

  • Published articles in numerous professional psychology journals

  • Experience in worker's compensation and forensic evaluation - including testimony, capacity, and deposition. 

  • Serving as a member of the Iowa Governor's Advisory Council for Brain Injuries 

  • Sharing his expertise as a member of the Brain Injury Association of America, the Brain Injury Alliance of Iowa, and the North American Brain Injury Society

  • Surveying rehabilitation facilities around the world as an accredited surveyor for the Commission on Accreditation of Rehabilitation Facilities (CARF).


  • Medical Education - Doctoral degree from West Virginia University

  • Internship - Neuropsychology and rehabilitation internship at the University of Oklahoma Health Sciences Center

  • Fellowship - Specialty post-doctoral fellowship in neuropsychology and rehabilitation in the Department of Physical Medicine and Rehabilitation at the University of Missouri Medical School and Rusk Rehabilitation Center

Dr. Allison Logemann

Dr. Allison Logemann joined the On With Life staff as a neuropsychologist in 2018.  She has experience in rehabilitation and academic/medical settings and has worked with various populations such neurodegenerative diseases, TBI/concussion, stroke, ADHD, learning disabilities, presurgical evaluations for epilepsy, tumor resection, bariatric and spinal cord stimulator. She also has training in psychotherapy and working with individuals with chronic pain.


  • Medical Education - Doctoral degree from the American School of Professional Psychology 

  • Internship - Clinical neuropsychology internship at the Acquired Brain Injury Program at Regional Rehabilitation Centre, Hamilton Health Sciences 

  • Post-Doctoral Residency - Clinical neuropsychology residency at the Department of Neurology at University of

    Nebraska Medical Center

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