Dr. Kellen is a licensed clinical psychologist. He received his clinical and neuropsychological training at the University of Nebraska Medical Center, Nebraska Medical Center, and Children’s Hospital in Omaha Nebraska. Michael has extensive training and clinical experience in behavioral pediatrics and pediatric sleep disorders; and in providing neuropsychological assessments to varied populations, such as those with neurodevelopmental disabilities, genetic disorders, and traumatic brain injuries. His training and work experience have been multidisciplinary an their setting. Michael has numerous publications in professional and academic journals in the field, and has coauthored several book chapters. He has presented his research findings throughout the United States and internationally and has been invited by the American Psychological Association and the International Society for Augmentative and Alternative Communication to present his research findings.