Our Doctors

Dr. Frank Mordini is a Neuropsychologist with over 25 years of professional experience. He received a Doctoral Degree in Clinical Psychology from the Illinois School of Professional Psychology in Chicago, Illinois. He completed his internship at the Cleveland Veterans Administration Medical Center and a Post-Doctoral Fellowship in rehabilitation and neuropsychology at the Rehabilitation Institute of Chicago, McGaw Medical Center, Northwestern University. Dr. Mordini was employed as a senior Psychologist at the Rehabilitation Institute of Chicago until 1994. In this capacity he provided inpatient and outpatient psychological services on the Spinal Cord Injury Unit and supervised graduate students and post-doctoral fellows. Dr. Mordini held staff privileges at Advocate Christ Medical Center and Palos Community Hospital. He is one of the founding members and co-directors of Chicago NeuroBehavior Specialists, a private practice in Orland Park. Dr. Mordini previously held an academic appointment at Northwestern University Medical School.

Dr. Mordini specializes in neuropsychological assessment of adults and older adults. He assesses individuals with dementia including Alzheimer’s, vascular dementia, Parkinson’s disease, Lewy Body Disease, frontotemporal lobe dementia, and other neurodegenerative disorders. Dr. Mordini also conducts neuropsychological assessments with individuals suffering traumatic brain injury, stroke, multiple sclerosis, cardiovascular disease, cancer, and other medical and neurological conditions impacting behavior and cognition. Additionally, as a specialist in rehabilitation psychology, Dr. Mordini has expertise in providing psychotherapy to individuals with medical conditions such as traumatic brain injury, spinal cord injury, amputation, stroke, and other disabling conditions. He furthers provides counseling and guidance to their family members and caregivers.

In addition to maintaining a private clinical practice, he provides consultation at nursing homes, independent and assisted living facilities, and sub-acute rehabilitation units. For further information about Dr. Mordini’s services, he can be contacted at (708) 349-4420.

Dr. John Atkinson received a Psy.D. in Clinical Psychology from Illinois School of Professional Psychology – Chicago in October 1998. He has been licensed as a clinical Psychologist in the state of Illinois since June 2000. He completed his pre-doctoral internship at University Hospital in Chicago, Illinois, with a training emphasis in psychotherapy and psycho-diagnostic evaluation with children, adolescents and adults. As part of his pre-doctoral internship, Dr. Atkinson also conducted research at the University of Illinois-Chicago, examining the psychological effects of juvenile onset macular degeneration. Additionally, his dissertation research explored the effects on specific memory functions following a brain injury. His post doctoral requirements were completed at the Individual Advocacy Group (IAG) in Bolingbrook, Illinois.

Dr. Atkinson additionally served as Director of Clinical Services/Staff Psychologist at the Individual Advocacy Group between 1997 and 2002, which is an organization that works in conjunction with the Department of Children and Family Services, Department of Corrections(Juvenile Division), and the Department of Human Services to provide therapeutic services to developmentally disabled and emotionally troubled children, adolescents, and adults. He also served as the Pediatric Neuropsychologist and staff educator at Hope Children’s Hospital.

Dr. Atkinson has been in independent private practice since 1998 providing psychotherapy to children, adolescents, young adults, and families. He also conducts comprehensive neuropsychological evaluations with children, adolescents, and young adults. The clinical population he serves include individuals with difficulties related to brain injuries, learning disabilities, attention deficit disorder and hyperactivity disorder, Autistic spectrum disorders such as Asperger’s disorder and Pervasive developmental disorder, emotional adjustment problems and emotional behavioral problems.

For further information about Dr. Atkinson's services, he can be contacted at (708) 349-4420.

Dr. Walsh joined Chicago NeuroBehavior Specialists in July 2016. He completed his post-doctoral residency in neuropsychology at Marianjoy. In 2008, he was named Director of the Psychology Department and Coordinator of Marianjoy’s Brain Injury Program.

Dr. Walsh completed his undergraduate degree in psychology at Loyola University of Chicago and attained his doctorate degree from the Illinois School of Professional Psychology. Dr. Walsh has previously functioned in the role of adjunct faculty at the Illinois School of Professional Psychology. He has taught graduate level courses including Biological Basis of Behavior, Neuropsychological Assessment, and Psychopharmacology.

He is a certified brain injury specialist through the American Brain Injury Association and provides clinical treatment and assessment of inpatient and outpatient brain injury survivors. His areas of specialization include neuropsychology, brain injury, sports concussion, mild cognitive impairment and dementia.

Dr. Walsh is affiliated with the American Psychological Association, National Academy of Neuropsychology, and the Illinois Brain Injury Association. In 2010, he was given the Make a Difference award by the Illinois Brain Injury Association for his work in sports concussion.

Dr. Walsh currently serves on the Governor’s Advisory Counsel for Spinal Cord and Head Injury for the state of Illinois. He also regularly participates in presentations to professionals and the community on topics related to brain injury and sports concussions.

Dr. Walsh can be reached by calling 708-349-4420 or via e-mail at pwalsh@chicagoneurobehavior.com.

Dr. Wilson received his Ph.D. in Clinical Psychology from the University of Illinois at Chicago in 2016. He completed a predoctoral internship at the Minneapolis Veterans Affairs (VA) Polytrauma Rehabilitation Center in 2016, and a two-year postdoctoral fellowship in Clinical Neuropsychology at the Baltimore VA Medical Center in 2018. Dr. Wilson has worked full-time for seven years providing comprehensive neuropsychological evaluations in a wide range of outpatient and inpatient treatment settings for numerous clinical populations–including individuals with cognitive difficulties related to neurological, psychiatric, neurodevelopmental, and chronic medical conditions.

Much of Dr. Wilson’s clinical training and practice has emphasized working with older adults, including differential diagnosis of dementia vs. mild cognitive impairment as well as civil capacity evaluations including determination of medical, testamentary, and financial decision-making abilities. Dr. Wilson additionally has a strong background in mental health assessment and has conducted numerous formal psychological and personality evaluations in clinical, medicolegal, and public safety contexts. Dr. Wilson also has extensive experience conducting psychoeducational assessments with clients of all ages to identify neurodevelopmental conditions such as ADHD, adult Autism Spectrum Disorder, specific learning disorders, and other forms of neurodiversity.

For further information about Dr. Wilson' s services, he can be contacted at (708) 349-4420.

Dr. Susan Valessares joined Chicago NeuroBehavior Specialists, Ltd. In November, 2021. She obtained her undergraduate degree in psychology from DePauw University with Phi Beta Kappa distinction. She received her PsyD in clinical psychology from the Illinois School of Professional Psychology Chicago-Northwest Campus in 1998. A two-year postdoctoral certificate for specialization in neuropsychological assessment was received in 2007 from Fielding Institute.

Dr. Valessares has spent the majority of her career providing services to children and adolescents. Upon graduation from college, she was an elementary school teacher for children from kindergarten through third grade. After receiving her doctorate, she was a contractual psychologist for local school districts for children in kindergarten through middle school. So, she is well-versed in providing recommendations to school systems including Individual Education Plans and 504 Plans. Also, she provided neuropsychological assessments for children in an inpatient psychiatric hospital. From 2008 to 2021, she was a pediatric neuropsychologist at Marianjoy Rehabilitation Hospital in Wheaton, Illinois. Her duties included inpatient psychotherapy and outpatient neuropsychological assessment.

Dr. Valessares specializes in assessing neuropsychological disorders, including Attention-Deficit/Hyperactivity Disorder, Executive Function Deficit, learning disabilities, dyslexia, concussions, acquired brain injuries, and cerebral palsy. Assessment of mood disorders including anxiety and depression is included in her evaluations. She works with patients from 6 years old to college students. She enjoys interacting with parents to provide an optimal outcome for their child.

For further information about Dr. Valessares's services, she can be contacted at (708) 349-4420.