Ph: 703-951-7527

Ph: 703-951-7527

Portrait of an adorable little boy weari

Ph: 703-951-7527




Neuropsychology is the study of the relationship between the brain and behavior. In children and adolescents, neuropsychological evaluations assess several cognitive domains, psychological and behavioral factors, and academic achievement. Going beyond what is obtained from a psychoeducational evaluation, results from a neuropsychological evaluation can provide insight into how an ongoing neurodevelopmental (e.g., autism, attention) or medical concern is impacting a child's cognitive processing. A neuropsychological evaluation can also offer a comprehensive understanding of the cognitive processes contributing to a child’s behavior, reveal how a child learns best, identify specific learning disabilities, and provide targeted intervention strategies to help the child succeed.


There needs to be a lot more emphasis on what a child can do instead of what they cannot do. 

    -Temple Grandin 

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Dr. Catherine McGill is a Pediatric Neuropsychologist with a particular interest in helping families understand their child’s unique potential from a strength-based approach. Dr. McGill specializes in assessing children with a variety of complex medical or neurodevelopmental concerns, but has a particular subspecialty in working with children who are experiencing a prolonged or complicated recovery from concussion. No matter the referral question or presenting concern, Dr. McGill is passionate about using information discovered from a neuropsychological evaluation to team-up directly with families and other medical and/or school providers to "fine-tune" the best supports and interventions for a child. 


In line with her passion for advocacy and outreach, Dr. McGill is currently an Executive Board member and the Symposium Director of the Sports Neuropsychology Society. She is also an active consultant for the Virginia Concussion Initiative with George Mason University. She previously held a faculty appointment in the Division of Neuropsychology at the Children's National Medical Center and was an Assistant Professor at The George Washington University School of Medicine in Washington, DC.  Conducting educational seminars, writing concussion policies, and teaming-up with local and national community partners to promote safety in youth sports was a particular focus for Dr. McGill during these appointments and continues to be an area of interest . Prior training of Dr. McGill's also includes an APPCN-approved fellowship in pediatric neuropsychology at the Children's National Medical Center and specialized internship in pediatric neuropsychology and special immunology at the University of Miami Miller School of Medicine and Mailman Center for Child Development. Dr. McGill completed her graduate training at the American School of Professional Psychology. 

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Dr. Elpida Nissirios is a Pediatric Neuropsychologist and licensed psychologist in Maryland, Virginia, and Delaware. She specializes in conducting comprehensive neuropsychological evaluations with children, adolescents, and young adults with a wide range of conditions that impact learning, behavior, and social-emotional functioning, including Attention-Deficit/Hyperactivity Disorder (ADHD), learning disorders, autism spectrum disorder, and social cognitive weaknesses. Dr. Nissirios strives to gain a comprehensive view of each child’s strengths and weaknesses, while also helping families understand their child’s unique potential. She is a strong advocate for children and is dedicated to providing recommendations that are ideally matched to the needs of children and their families.


Dr. Nissirios completed her graduate training at American School of Professional Psychology. Throughout her training, Dr. Nissirios developed skills in neuropsychological assessment, psychotherapy, parent training, and behavior management of children and young adults. She was fortunate to have exceptional training experiences including Children’s National Medical Center, Mt. Washington Pediatric Hospital, and Kennedy Krieger Institute. She then went on to complete her predoctoral internship at Nemours/Alfred I. duPont Hospital for Children. Following this training, Dr. Nissirios completed a two year APPCN-approved fellowship in Pediatric Neuropsychology at Dartmouth Hitchcock Medical Center with areas of focused interest to include complex medical, autism spectrum disorders, ADHD, and other neurodevelopmental disorders. Each of these experiences has provided Dr. Nissirios with a very rich understanding of child development.


Dr. Nissirios understands that every individual has his or her own unique strengths and weaknesses, and it is her goal to help identify these exceptional characteristics, so your child is able to reach his or her highest potential. She is committed to working with families to clarify diagnoses and ensures that you have a complete understanding of your child and how multiple factors are contributing to your child’s functioning. She then relies on up-to-date research to identify appropriate interventions to optimize academic, social and emotional functioning.


Dr. Nissirios is also fluent in Greek.



Available for ages 2 - 22

Unlock Your Child's Potential

A comprehensive neuropsychological evaluation provides detailed information about your child’s cognitive, psychological, behavioral, and academic functioning. Specific cognitive domains assessed include intelligence, visual and verbal learning/memory, language, fine motor, and visual motor/visual spatial abilities. Brief and sustained attention as well as many aspects of executive function (e.g., inhibition, working memory, cognitive flexibility, planning/organization) are also evaluated. All core academic domains are assessed and compared to the child’s cognitive skills to detect if an underlying learning disability is present.  Information gathered about your child’s social-emotional and behavioral functioning is then integrated into what is discovered about their cognitive and academic abilities, providing a complete understanding about why your child may be exhibiting challenges in the home, school, or social setting. This evaluation includes two days of assessment, a discussion of all results with the family, and a comprehensive report able to provide ample information to facilitate an individualized treatment or intervention plan.

A more focused  neuropsychological evaluation, including brief assessment and consultation necessary for concussion intervention and treatment planning, is available upon request if deemed clinically appropriate. 


This brief assessment is designed to capture information about your child's intellectual abilities and satisfy necessary admissions requirements for some private schools.

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Drs. McGill and Nissirios are available upon request for in-office consultation with families or community-based consultation with schools and community partners.

Payment is kindly expected on the first date of service. Major credit cards, including HSA and FSA, and check are accepted. Most services provided by McGill Neuropsychology are "insurance friendly" and may be covered in full or partially by several out-of-network medical or mental health insurance plans. Families will be provided with all costs prior to the appointment and given the necessary paperwork to file a claim with their insurance company after rendered services.

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Psychoeducation evaluations are designed to examine for the presence of a learning disability. These brief (typically half-day) evaluations focus on assessing a child’s intellectual (IQ) and academic skills and offer some information regarding learning/memory, attention, and/or social-emotional factors.

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This evaluation assesses for a possible autism spectrum disorder and is appropriate for children and adolescents who exhibit difficulties with social development, communication/language, and/or behavioral difficulties. Families may choose between a comprehensive evaluation or diagnostic service. The latter is a brief evaluation focused on assessing a child's intellectual (IQ) and social functioning.​




4416 East West Highway, Suite 201

Bethesda, Maryland 20814

8401 Greensboro Drive, Suite 550

McLean, Virginia 22102

Phone: 1-703-951-7527

Fax: 1-571-402-1136

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Catherine McGill PsyD, LLC

Pediatric Neuropsychologist 

Ph: 888-665-8863