Meet Our Doctors

Dr. Meghan T. Lee earned her bachelor’s degree from Colorado State University and both her master’s and Ph.D. from Auburn University. She furthered her education in Neuropsychology through UC Berkeley Extension and Brigham Young University.

Dr. Lee completed her doctoral internship at Utah State Hospital and residency/fellowship at Children’s Neuropsychological Services in Boston, during which time she specialized in pediatric neuropsychology. Throughout her training and career, Dr. Lee has gained comprehensive experience in Neuropsychology across a variety of settings around the U.S., including hospitals (both acute and long-term care), private practices, correctional facilities, and university counseling centers. Although she has specialized in the pediatric population, Dr. Lee has also worked with the younger and older adult populations across a variety of settings. Deciding to return home to Colorado, she initiated Horizon Neuropsychological Services to help children, youth, and young adults achieve new heights in their development. In sum, Dr. Lee’s breadth of experience throughout her clinical and educational work has led to a wide range of specialties and skills valuable in understanding the complexity of human behavior and development.

Dr. Lee was recently accepted into the prestigious Johns Hopkins MBA program starting in Fall of 2026, where she will focus on data analytics with a special emphasis on the transformative role of AI in shaping the healthcare industry. As part of this achievement, she was awarded the ROMBA LGBTQ+ Fellowship, a distinguished honor recognizing and fostering the development of future LGBTQ+ business leaders. The fellowship, a collaborative initiative between leading business schools and Reaching Out MBA (ROMBA), underscores her commitment to advancing inclusivity and innovation. ROMBA, a 501(c)(3) organization, is dedicated to inspiring, educating, and connecting LGBTQ+ MBA students and alumni, building a robust network of the next generation of leaders.

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. 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.

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. Vanessa G. Williams earned her doctoral degree in Clinical Psychology from Palo Alto University, completed a pre-doctoral internship in Neuropsychology at the Minneapolis VA Medical Center, and completed a two-year postdoctoral fellowship in Clinical Neuropsychology at the Warren Alpert Medical School of Brown University. She has worked primarily in hospital and academic settings, with a recent shift to private practice settings.

Dr. Williams offers neuropsychological evaluations that include a comprehensive assessment of an adult/older adult’s cognitive functioning for a variety of reasons, including (but not limited to): questions of neurodegenerative conditions such as Alzheimer’s disease, vascular dementia, dementia with Lewy bodies, or other types of dementia; mild cognitive impairment versus depression; Parkinson’s disease, including pre- and post-surgical (DBS) testing; autoimmune or demyelinating conditions such as multiple sclerosis; neurological injury/events like stroke, brain tumor, or moderate to severe TBI; non-forensic assessment of cognitive functioning in adults who are having difficulty in a competitive work environment; complex medical conditions; and cognition in epilepsy.

Dr. Williams enjoys working with (older adult/adult) patients, their families, and their medical providers to offer comprehensive assessment, diagnostic considerations, education, and recommendations related to “normal” aging, brain health, cognitive decline, and cognitive disorders/dementia.

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-Duane 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.

Ashleigh Beaulieu, Psy.D., earned her bachelor’s degree in Psychology and a master’s degree in Biochemistry from the University of Maine. She went on to complete her Doctorate in Clinical Psychology (Psy.D.) at Nova Southeastern University in Florida. As part of her doctoral training, she completed a pre-doctoral internship at Rocky Mountain Regional VA Medical Center, specializing in Geropsychology with a focus on Neuropsychology.

Dr. Beaulieu has developed broad and in-depth experience in Neuropsychology through her work in diverse clinical settings, including hospitals, outpatient memory clinics, university counseling centers, private practices, and in-home assessment services. While she specializes in working with older adults, her training also includes experience with children, adolescents, and young adults. In addition to her clinical work, Dr. Beaulieu contributed to research at the University of Miami Miller School of Medicine’s Alzheimer’s Disease Research Center, where she focused on validating Spanish-language neuropsychological measures to improve early detection of cognitive impairment in diverse populations.

Dr. Beaulieu is excited to continue her professional development through a post-doctoral residency in clinical neuropsychology at Horizon Neuropsychological Services.

Rachael Peck earned her Ph.D. in clinical psychology from the University of Colorado in Colorado Springs. She completed her pre-doctoral internship at the Rocky Mountain Regional Veterans Affairs Medical Center, with emphasis on neuropsychological assessment and health psychology for adults and older adults. Rachael also holds an M.A. in experimental psychology and a B.A. in psychology and studio art, both from James Madison University.

Rachael’s clinical training has focused on assessing adults with neurological and psychiatric conditions, including dementias, traumatic brain injuries, strokes, movement disorders, and neurodevelopmental disorders, as well as conducting pre-neurosurgical evaluations for deep brain stimulation. She also has experience working with patients struggling with posttraumatic stress disorder and other psychological conditions. She is deeply committed to seeing the whole person—not just the symptoms—by helping patients understand the “why” behind their cognitive challenges and providing personalized recommendations to support their path forward.

In addition to her clinical work, Rachael serves as a U.S. Air Force reservist. Her military experience includes conducting cognitive research, supporting survivors of military sexual trauma, and serving alongside aircraft maintainers. She currently teaches in the Department of Behavioral Sciences and Leadership at the U.S. Air Force Academy.

Dr. Olivia Doyle earned her bachelor’s degree from Lewis & Clark College and her doctorate in clinical psychology from Oregon Health & Science University. She completed her pre-doctoral internship at the University of Minnesota.

Dr. Doyle’s training in academic medicine focused on assessing and treating children and adolescents with complex medical and neurodevelopmental histories. She uses a person-centered approach to help children and adolescents understand their unique brains, while guiding families to support and recognize their child’s strengths.

She is very excited to complete her residency in pediatric neuropsychology at Horizon Neuropsychological Services.

Casey completed her undergraduate work in Philadelphia at University of the Sciences (now St. Joseph’s University) and obtained her master’s and doctorate degrees from Kean University in New Jersey. She completed her predoctoral internship in Idaho Falls, Idaho, at a community mental health center that focused on providing psychological and neuropsychological assessment services, along with counseling, to individuals across the lifespan.

During her graduate training, Casey worked in various clinical environments, including a hospital, school, community mental health clinic, and private neuropsychological clinic. Her primary clinical focus is on providing comprehensive psychological and neuropsychological evaluations to provide diagnostic clarification and appropriate recommendations for clients and their families. She has experience working with a wide range of presenting concerns, including various neurodevelopmental, mood, personality, and neurocognitive disorders.

Casey is excited to bring her passions to Horizon Neuropsychological Services to continue learning and serving the community.

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.