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. Stefani received a Ph.D. in Clinical Psychology from Depaul University in June 1988. He has been a licensed Clinical Psychologist in the state of Illinois since November 1989. He completed his pre-doctoral internship at Henry Ford Hospital in Detroit, with a year long specialization in child neuropsychology. His post-doctoral requirements were completed at the Rehabilitation Institute of Chicago. Dr. Stefani is a former senior psychologist at the Rehabilitation Institute of Chicago, where he served for more than 5 years as the Pediatric Neuropsychologist. Dr. Stefani also served as the Pediatric Neuropsychologist in the Pediatric Rehabilitation program and the Pediatric Development Clinic at Advocate Christ Hospital and Medical Center. He has served as a clinical supervisor to doctoral students in clinical psychology, and to post doctoral fellows, and psychologists completing licensure requirements. Dr. Stefani was formerly a faculty member at Northwestern University Medical School as a Clinical Instructor in the Department of Psychiatry and Behavioral Sciences.


Dr. Stefani has been in full time private practice since 1996. His practice focuses on providing neuropsychological evaluations to children ranging in age from pre-school to college age. He specializes in providing neuropsychological evaluations for children with attention and learning problems, neurological disorders, traumatic brain injuries, autism spectrum disorders, Asperger’s Syndrome, and other neurodevelopment disorders. Dr. Stefani also provides consultation to assist parents, therapists, and educational teams and schools in program and treatment planning.


Dr. Stefani is a member of the Medical Advisory Board of the DuPage Easter Seals / UCP, and the Professional Advisory Committee of Charlie’s Gift, an organization specializing in helping children and families affected by autism spectrum disorders. In the past he has served on the Illinois State Board of Education Task Force for children with brain injuries, which was responsible for developing criteria to identify and designate children with brain injuries for special education services, training educators throughout the state on issues pertaining to students with brain injuries, and developing a resource manual for teachers. Dr. Stefani has also served on the professional advisory board of the Illinois Chapter of the Brain Injuries Association, and in this capacity developed and ran a summer camp for children with brain injuries..

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.

Robin Grais-Speizman received a M.S.Ed. in Educational Psychology from National Louis University in June of 1994. She received her Bachelors Degree from the University of Wisconsin, Madison, in 1989, in both Rehabilitation Psychology and in Special Education with a Type 10 Certification. Robin Grais-Speizman taught Special Education classes at Saint Josephs Carondelet Child Center in Chicago. She then worked at the Rehabilitation Institute of Chicago as a Pediatric Behavioral Specialist and Senior Neuropsychometrician for 10 years. She performed neuropsychological testing evaluations to both inpatients and outpatients suffering from brain injury. She also provided cognitive retraining and school reentry services to children and adolescents upon inpatient discharge and often continued for long term follow-up.


Since 1999, Robin has been an associate in the practice Roger Stefani and Associates, now known as Chicago NeuroBehavior Specialists in Orland Park. She continues to provide neuropsychological testing to patients with brain injuries, neurological conditions, and learning and educational disorders. She and Dr. Stefani have developed an Executive Function Clinic to evaluate and treat Executive Function disorders in children, adolescents, and young adults.

Dr. Margret O’Reilly received a Psy.D. in Clinical Psychology from Adler University-Chicago, an APA accredited program in August 2014. She earned her M.A. in Counseling Psychology with a concentration in Art Therapy from Adler University in August, 2009, and trained at The University of Chicago Comer Children’s Hospital. She completed her pre-doctoral internship at Primary Care Psychology Associates where she worked in collaboration with Northwestern Memorial Physicians Group Pediatrics and Adult Internal Medicine in Chicago, IL. In this position, she developed expertise in behavioral health psychology with an emphasis in psychotherapy, psychodiagnostic evaluation and physician consultation services. Throughout her doctoral program, she worked as an assessment research and teaching assistant at Adler University. Her doctoral research focused on cognitive vulnerabilities associated with academic anxiety. Dr. O’Reilly has been a Licensed Professional Counselor in the state of Illinois since August, 2010. She earned a certificate in Primary Care Behavioral health through the University of Massachusetts Medical School in June, 2011.


Dr. O’Reilly holds extensive clinical experience in the treatment and evaluation of children, adolescents, and adults. She specializes in treating individuals with chronic medical illnesses, physical disabilities, learning and developmental disabilities, memory impairment, epilepsy, ADHD, and mood disorders. She has unique expertise in implementing art therapy interventions when working with children and adolescents coping with medical trauma, adjustment disorders, OCD, anxiety and depression. Dr. O’Reilly conducts comprehensive neuropsychological evaluations with children and adults.

George K. Bialkowski, Psy.D. completed his undergraduate studies at DePaul University, where he majored in Political Science and Psychology, with a minor in Philosophy. He earned his Master and Doctoral level degrees from Midwestern University. Dr. Bialkowski completed an internship at the Regina Qu’Appelle Health Region in Saskatchewan, Canada, with a concentration in child and adolescent neuropsychology, which included a strong focus on evaluating fetal alcohol syndrome and assessing autism spectrum disorders. In 2012 he finished a postdoctoral residency at Neuropsychology Ltd. in Tucson, Arizona, which is one agency that comprises the greater Arizona Psychology Training Consortium. At Neuropsychology Ltd., Dr. Bialkowski specialized in adult neuropsychology. Once independently licensed as a Psychologist, Dr. Bialkowski grew allured to the field of Health and Rehabilitation Psychology, serving individuals in an inpatient rehabilitation facility, while concurrently performing adult and geriatric neuropsychological evaluations. Dr. Bialkowski embodies a trove of information related to neuropsychological services, rehabilitation psychology, and extensive experiences counselling the child and adolescent population. Recreationally, Dr. Bialkowski enjoys spending time with his wife and their first-born son. He is also an avid photographer. Please note, Dr. Bialkowski speaks Polish fluently.

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.