Meet The Johnson Neuropsychology Team

Kim Johnson, Psy.D., LSSP


Dr. Johnson is a clinical neuropsychologist and Licensed Specialist in School Psychology who specializes in understanding and evaluating the relationship between brain disorders and behavior. She is essentially passionate about neuropsychological evaluations  and  enjoys evaluating individuals 4 years old through senior adult for a wide range of learning problems, developmental delays, autism, ADHD, traumatic brain injury, complex medical and neurological problems,  emotional-behavioral disorders, brain injuries, strokes and various neurodegenerative disorders.

At 16 years of age, Dr. Johnson was one of the youngest students to enroll at Southern Methodist University and graduate with an undergraduate degree in psychology.  She earned her Master of Arts degree and Doctorate degree in Clinical Psychology from the California School of Professional Psychology in Fresno, California in 2001.  She completed two post-doctorate programs:  a one-year program in school psychology and a two-year program in pediatric and adult neuropsychology.  Dr. Johnson’s training and experience comprises diverse settings: evaluating students in a school setting, working with juvenile offenders and severely emotionally disturbed adolescents in residential facilities, diagnosing adults in outpatient and inpatient facilities, and providing consultative services to several government agencies about various neurocognitive dysfunction. She is also one of the few neuropsychologists in Texas who is trained in Aviation Psychology to perform FAA-required evaluations on pilots and air traffic controllers.

In 2009, Dr. Johnson established Johnson Neuropsychology,  an independent practice,  to provide personalized care and neuropsychological expertise across the lifespan to individuals who have disabilities and complex medical presentations as well as to gifted individuals and neurotypical individuals who want documentation of their cognitive abilities.

Deborah Lowe, Ph.D.


Dr. Lowe is a clinical neuropsychologist who specializes in adult and geriatric neuropsychology. She completed her undergraduate degree in psychology at Biola University in La Mirada, California. She earned her Master of Science and Doctor of Philosophy degrees in clinical psychology with emphasis training in neuropsychology from Texas A&M University. She completed a pre-doctoral internship in neuropsychology at the Charleston Consortium in South Carolina, as well as a two-year post-doctoral fellowship in neuropsychology at the University of Oklahoma Health Sciences Center. Dr. Lowe has specialized training and experience in medically complex populations including various dementia syndromes, movement disorders, epilepsy, stroke, brain injuries, neurodevelopmental disorders, and other neurological and chronic health problems affecting cognitive functioning.

Amy McMahan, Ph.D., LP, LSSP


Dr. Amy McMahan is a pediatric neuropsychologist and school psychologist who earned her Ph.D. from Texas Woman’s University. She completed a year-long APA-accredited doctoral internship through the Virginia Beach City Public Schools and a two-year APPCN-accredited postdoctoral fellowship in pediatric neuropsychology through a private practice outside Boston, MA.She has worked with children and adolescents from a variety of backgrounds and spanning a wide range of ages, from early toddlerhood through college-aged! Dr. McMahan’s training has provided her particular experience with assessing ADHD, autism, dyslexia, learning problems, emotional-behavioral disorders, developmental delays, and other conditions. Herapproach focuses on the whole child – to learn about their unique strengths and areas of vulnerability to best support a positive developmental trajectory. Dr. McMahan’s background in both neuropsychology and school psychology provides a unique lens in which to understand the child’s and family’s needs and create a meaningful plan of action.

Ashlee Peterson, B.S., M.S.


Ashlee Peterson is a psychometrist who administers standardized tests under the supervision and licensure of Dr. Johnson. Ashlee completed her Master’s Degree in Clinical Psychology from Argosy University in Dallas, Texas. She received her Bachelor’s Degree in Behavioral Science with a minor in sociology from Hardin Simmons University in Abilene, Texas. Prior to obtaining her master’s degree, she worked as a cake decorator for almost ten years. She admits if she did not choose psychology she would have been in culinary school. While working on her Master’s degree, she completed her training/practicum at Johnson Neuropsychology before accepting accepting a full-time position with the Company. She has been trained in both psychological and neuropsychological test administration for pediatrics and adults. She especially enjoys working with individuals with intellectual disabilities, high school and college-bound students with learning disabilities, and individuals with psychosis. She plans on one day completing her doctoral degree in order to perform psychological and neuropsychological assessments for all ages.

Kim Lawson, BS, CSP


Kim Lawson is a Certified Specialist in Psychometry (CSP) with over 14 years of psychological and neuropsychological testing experience. She is one of only a few CSP’s in Texas, earning this distinction in 2012.

Kim graduated from Friends University in Wichita, Kansas with a Bachelors Degree in Psychology and Human Services. She has conducted neuropsychological testing in a variety of outpatient, rehabilitation and hospital settings, and has experience testing patients with a variety of neurocognitive disorders including traumatic and acquired brain injuries, attentional disorders, and memory disorders.

Cortni Smith, B.A., M.S.


Cortni Smith completed her bachelor’s degree in Clinical Psychology from the University of Texas at Arlington, and her master’s degree in Clinical Neuropsychology from the University of Texas at Tyler. During her last year of graduate studies, she completed a year-long practicum in neuropsychological and psychological assessment. Additionally, she was a graduate teaching assistant for Physiological Psychology and Fixed Battery Approach to Neuropsychological Assessment. Cortni has continued to work as a psychometrist over the last five years in a multitude of clinical settings, including private practice, inpatient hospitals, outpatient hospitals, and neurorehabilitation. She has experience in testing from adolescent to geriatric populations, specializing in neuropsychological and psychological assessment for Dementia, TBI, Stroke, Parkinson’s, Epilepsy, Multiple Sclerosis, ADHD, and other and cognitive dysfunctions.

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