Menu
Owner, Licensed Psychologist
Board Certified Clinical Neuropsychologist
Katherine T. Baum, Ph.D., ABPP is a board-certified clinical neuropsychologist and the owner and founder of Comprehensive Neuropsychology Services (CNS) in Bryn Mawr, Pennsylvania. She specializes in evaluations and treatment planning for children, adolescents, and young adults with neurological, medical, developmental, and genetic conditions.
Known for her thorough yet compassionate approach, Dr. Baum has been described by families as warm, patient, and deeply dedicated, and by colleagues as “an asset to the special needs community.” Her evaluations are highly regarded by schools and help shape individualized educational programming for children with disabilities. She also places strong value on incorporating each child and teen’s perspective into the process and provides them with direct feedback—whether through a narrative story for younger children or a patient-friendly summary letter for teens—so they feel empowered and understood…
Licensed Psychologist
Certified School Psychologist
Hollie Duonnolo, Ph.D., NCSP, is a licensed psychologist and nationally certified school psychologist based in Pennsylvania, providing care both in person and through telehealth in 43 states. She works with children, teens, and adults who are navigating anxiety, depression, and co-occurring conditions such as ADHD, autism, learning differences, and neurological/medical conditions.
Dr. Duonnolo is committed to evidence-based, neuroaffirming therapy that helps clients feel understood and supported. She has particular expertise in working with individuals with neurodevelopmental and learning differences, tailoring strategies to each person’s unique strengths. In addition to therapy, she offers executive functioning coaching, guiding clients to develop practical skills in organization, time management, and planning so they can thrive at school, at work, and in daily life….
Licensed Psychologist
Pediatric Neuropsychologist
Julia Guerin, Ph.D. is a pediatric neuropsychologist and licensed psychologist in Pennsylvania who works with children, adolescents, and young adults facing complex developmental, medical, and neurological conditions. She specializes in comprehensive neuropsychological assessment for individuals struggling with attention, executive functioning, and learning challenges, including dyslexia and other learning disabilities.
Dr. Guerin’s clinical and research background has focused on the cognitive and environmental factors that shape reading development. She has published on these topics and brings years of experience supporting students with diverse learning needs. Trained at top pediatric hospitals and academic centers, she is skilled at working with children and families managing both medical complexities and educational challenges. Dr. Guerin is passionate about helping families understand their child’s unique pattern of strengths and challenges, and providing comprehensive recommendations that support them in reaching their full potential…
Post-Doctoral Fellow
Katelyn Grilli, PsyD, is a Clinical Neuropsychology Post-Doctoral Fellow with training in the assessment of neurological and psychological conditions across the lifespan, including with individuals with ADHD, learning disabilities, concussion, traumatic brain injuries, stroke, and memory impairments.
Dr. Grilli is passionate about helping individuals understand how brain-based changes affect thinking, emotion, and daily life. She specializes in neuropsychological assessment, diagnostic clarification, and collaborative treatment planning, often integrating cognitive-behavioral strategies into her work. As a post-doctoral fellow, she continues to expand her expertise under the guidance of neuropsychologists, while also staying engaged in research and professional development…
In addition to services provided by our primary team, adult ADHD, disability focused, and neuropsychological evaluations are also available through a trusted, board-certified consulting neuropsychologist with extensive experience supporting individuals with neurodevelopmental, psychiatric, and complex medical or neurological conditions. Flexible options, including telehealth and weekend appointments, are available to better meet your needs.
