Dr. Harrison is an alum of the University of North Texas, where he received both a Masters and Ph.D. in Clinical Psychology. Prior to attending UNT, he received a bachelor's degree in Psychology from the University of Texas at Dallas. He completed an internship in Child Psychology at the University of Arkansas for Medical Sciences Child Study Center. He also completed a fellowship focusing on adult and child neuropsychology at a consortium associated with the University of Texas Health Science Center in Dallas. After he received his license, he also studied clinical psychopharmacology, 

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Dr. Harrison was the founder and Clinical Director of the Center for Psychological Development, a regional treatment and assessment center providing services to children and adults across North Texas and Southern Oklahoma. He has over 25 years of experience providing psychological and neuropsychological assessments for children and adults, with expertise in evaluating autism, ADHD, traumatic brain injury, Alzheimer’s disease and other dementias, as well as other neurological diseases affecting brain functioning. In addition, he has expertise in the evaluation and treatment of psychological trauma, as well as the forensic evaluation of children’s outcries in child abuse cases.

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He has provided inpatient consultations at various acute care, rehabilitation, and psychiatric hospitals, as well as providing services under contracts with the Texas Department of Assistive and Rehabilitative Services, Texas Department of Family and Protective Services, the Veteran’s Administration, Mental Health Mental Retardation programs, Juvenile Probation departments, and Juvenile Detention Centers. He has served as a court appointed expert in hundreds of cases in both civil and criminal trials, ranging from those with no press coverage, to those that have been highly publicized.

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Dr. Harrison has provided seminars and workshops on such topics as the neuropsychological evaluation of autism and dementia, forensically sensitive child psychotherapy, cognitive rehabilitation with ADHD and traumatic brain injury patients, developmental evaluation of preschool children, and the neuropsychological underpinnings of psychiatric disorders. He has provided supervision to psychology students, interns, and post-doctoral psychologists, including serving as the Training Director of an APPIC approved internship program.

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He has been a member of the American Psychological Association, Texas Psychological Association, National Academy of Neuropsychology, and International Neuropsychology Society. He is a past President of the Texoma Area Psychological Association.

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