Meet Our Doctors

Dr. Ramya Rangamannar earned her bachelor’s degree from Barnard College at Columbia University and her master's and doctorate degrees in Clinical Psychology from the University of Hartford. She completed her pre-doctoral clinical internship at the University of Florida and post-doctoral fellowship in pediatric neuropsychology at the Children’s Hospital Colorado.

Over the last decade, Dr. Ramya has gained clinical expertise in a multitude of settings (i.e., medical, psychiatric, private practice) with children from early toddlerhood through early adulthood. Despite specialization in pediatrics, Dr. Ramya has also worked with younger and older adult populations in her training. She prides herself on understanding the "whole child" in the context of their home/family, school, and social realms and in providing families with tangible resources and recommendations in supporting their child’s development and success.

Dr. Matthew Conway earned his Doctorate in Psychology with a concentration in neuropsychology from The Chicago School of Professional Psychology and his Bachelor’s degree in Psychology from Brown University. He has received formal training in neuropsychology from top-tier hospitals and clinics across the U.S., including Advocate Illinois Masonic Medical Center and Central DuPage Hospital in Chicago, as well as Lenox Hill Hospital in New York City. Most recently, he served as Clinical Director at Children’s Neuropsychological Services within the Boston area.

Matthew is known for his unique ability to connect with clients and their families, utilizing a strengths-based approach to facilitate meaningful change. He specializes in addressing a wide range of complex psychiatric presentations with areas of clinical expertise, including Autism Spectrum Disorder, ADHD and executive functioning deficits, neurodevelopmental disorders, and complex differential psychiatric diagnoses. His focus is on helping individuals understand themselves, learn how their brains work, and creating a plan to achieve their best versions.

Dr. Dorothy Nguyen-Daniels earned her doctoral degree with a concentration in neuropsychology from the Illinois School of Professional Psychology. She completed her pre-doctoral internship at Truman Memorial Veterans’ Hospital in Missouri and her two-year postdoctoral fellowship in neuropsychology at the University of Kansas School of Medicine-Wichita. In addition, she obtained a master’s degree in gerontological counseling from Adler University in Illinois.

Dr. Nguyen-Daniels provides comprehensive outpatient evaluations of adults and older adults presenting with various neurological conditions, including dementia, mild cognitive impairment, concussion/traumatic brain injury, neurodegenerative disease, stroke, cerebrovascular disease, epilepsy, movement disorders, autoimmune disorders, and complex medical/psychiatric conditions. She also has experience conducting pre-surgical evaluations (e.g., epilepsy, DBS) and inpatient consultations. In her clinical work, Dr. Nguyen-Daniels strives to use a thorough, compassionate, and culturally-sensitive approach that enables patients to understand better their strengths, areas of growth, and helpful resources to function and feel their best.

Dr. Jacqueline Slemp earned her bachelor’s degree from the University of Connecticut and her master’s and doctoral degrees from the Graduate School of Applied and Professional Psychology at Rutgers, The State University of New Jersey. She completed her pre-doctoral internship in lifespan neuropsychology at Staten Island University Hospital and her two-year postdoctoral fellowship in pediatric neuropsychology at Lenox Hill Hospital in New York City.

Dr. Slemp has trained across a variety of settings, including academic medical centers, outpatient clinics, and schools. She has expertise working with children, adolescents, and young adults with a wide array of neurodevelopmental disorders, acquired injuries, and medical conditions, and she has a passion for understanding human development. Additionally, she has training with adult and geriatric populations. Dr. Slemp strives to understand a child’s ongoing challenges within their unique ecological contexts and provide individuals and families with action-oriented recommendations for home and/or school.

Dr. Alison Datoc is a fellowship-trained clinical neuropsychologist with a subspecialty emphasis in sports concussion management. She completed her postdoctoral fellowship at the University of Texas Southwestern Medical Center and Children’s Health Andrews Institute in lifespan sports neuropsychology, where she was responsible for assessing, diagnosing, and managing concussions in children and adults. She has worked with thousands of patients with concussions immediately after their injury on the sidelines of sporting events and within days to weeks of their injury in the office or through virtual evaluations. She has provided baseline and sideline concussion evaluations for NFL, NHL, AHL, US Figure Skating, MLS Next Pro, and high school football athletes. In addition, she has several published peer-reviewed articles on concussion and later-in-life brain health in athletes.

Dr. Datoc completed her doctorate in clinical psychology with a concentration in neuropsychology at Nova Southeastern University and her pre-doctoral internship at the Rocky Mountain Regional Veteran’s Affairs Medical Center. She is not only passionate about guiding patients and their families through the concussion recovery process but also improving the quality of life for those with neurodevelopmental, neurological, medical, psychiatric, and neurodegenerative conditions. Dr. Datoc is dedicated to helping children and adults recognize and reach their highest potential by providing a comprehensive view of each individual’s strengths and weaknesses.

Nicole Liedike earned her bachelor’s degree in psychology from Wilmington University and her master’s and doctorate degrees in clinical psychology from The Chicago School of Professional Psychology. She completed her pre-doctoral internship in clinical psychology at a private practice in Colorado Springs, CO that primarily focused on neurodevelopmental, psychological, and neuropsychological assessments with populations ranging from 18 months of age in older adulthood.

Nicole’s training experience prior to her graduate career was in acute psychiatric hospitalization care working with adolescents, adults, older adults, and dual diagnosis populations. During her graduate career, she has worked with preschool-aged children in a school setting, and with adults and older adults in private psychological practice and outpatient medical settings providing therapeutic support and conducting psychological and neuropsychological evaluations. Her future career goal is to become a board-certified neuropsychologist focusing on assessment for traumatic brain injury and neurodegeneration populations. With her passion for neuropsychological assessment, Nicole is enthusiastic about completing her lifespan residency in clinical neuropsychology at Horizon Neuropsychological Services.

Spenser Nye earned her bachelor’s degree from Kent State University and her master’s and doctorate degrees from the University of Denver. She completed her pre-doctoral internship at a Fort Collins, Colorado practice that focused primarily on neurodevelopmental, psychological, and neuropsychological assessments with individuals from across the lifespan.

During her graduate training, Spenser has trained across various settings, including emergency and outpatient medical settings, community mental health centers, and private practices. She has experience working with children, adolescents, and adults with a variety of neurodevelopmental disorders and neurological conditions, including autism, ADHD, FASD, and traumatic brain injury. She has a passion for understanding how changes in the brain affect cognition and behavior and hopes someday to become a board-certified neuropsychologist with a focus on assessment. With her passion for pediatric neuropsychological assessment, Spenser is beyond excited to complete her residency in pediatric neuropsychology at Horizon Neuropsychological Services.

Kevin Ball earned his bachelor's degree from Mercyhurst University and his master's and doctorate degrees from Widener University, specializing in neuropsychology, school psychology, and biofeedback. His pre-doctoral internship included rotations in adult forensic neuropsychology at a private practice near Philadelphia, PA, and pediatric neuropsychology at Good Shepherd Rehabilitation Hospital in Bethlehem, PA. He is also a certified school psychologist in Pennsylvania and board-certified in biofeedback.

Kevin's graduate training involved clinical experiences in private practices, schools, and an inpatient/outpatient medical center. He has evaluated individuals across the lifespan presenting with neurodevelopmental, medical, and psychological concerns. Kevin hopes to pursue board certification in neuropsychology, with a particular focus on helping individuals who have sustained a traumatic brain injury. With his passion for pediatric neuropsychological assessment, Kevin is 'psyched' to complete his pediatric clinical neuropsychology residency at Horizon Neuropsychological Services.

Dr. Molly Sullan earned her doctorate degree in clinical psychology, with a specialization in neuropsychology, from the University of Florida. She completed her pre-doctoral internship and her two-year neuropsychology fellowship at the VA San Diego Healthcare System/University of California, San Diego.

Dr. Sullan’s research has focused on understanding the relationship between post-traumatic sleep difficulties and cognitive, psychological, and physiological recovery for patients with a history of acquired brain injury (e.g., traumatic brain injury and stroke). Clinically, she has experience in the assessment of a broad spectrum of neurological disorders both in inpatient and outpatient settings, including brain tumors, epilepsy and movement disorders (e.g., Parkinson’s disease), memory disorders and dementia, stroke and cerebrovascular disease, traumatic brain injury, demyelinating lesions, autoimmune disorders, complex psychiatric concerns, substance use disorders, and neurodevelopmental considerations.

Dr. Sullan is an affiliate faculty member at Horizon, which means that she does not currently see patients clinically. She works in research and remains involved with the HNS didactic series related to the HNS training program.