Listed alphabetically by last name.
With over 10 years of clinical experience, Dr. Jennifer Barton brings a deeply compassionate, evidence-based approach to understanding how you think, feel, and function. While she is a highly trained licensed clinical neuropsychologist with a background in complex assessments across the lifespan, her practice is driven by a passion for helping people find clarity—especially those navigating ADHD. Dr. Barton specializes in ADHD evaluations because she knows that attention struggles rarely exist in a vacuum. Attention concerns frequently overlap with mood shifts, trauma, hormonal changes, learning differences, or past brain injuries. Because of this complexity, she doesn't believe in rushed diagnoses. Dr. Barton meets you with genuine empathy, aiming to replace that self-doubt with answers. You won't just leave with a diagnosis; you will leave with practical, real-world coaching strategies tailored to fit your actual daily life.
Dr. Janice Bigby is a Texas-licensed psychologist who helps children, teens, and adults understand ADHD and what to do next. With a PhD in Health Psychology and an M.S. in School Psychology, she brings more than 20 years of experience from public and charter schools, private practice, and mental health clinics, including hundreds of ADHD evaluations and the supervision of graduate students and doctoral residents. Her lifestyle-focused, health psychology perspective looks at the whole person, including how ADHD overlaps with anxiety, depression, and relationship challenges. Dr. Bigby explains results in clear, everyday language and recommends school and work accommodations alongside practical, evidence-based strategies people can start using right away.
Dr. Emmett Chappelle is a board-certified adult psychiatrist providing evidence-based outpatient care in Saint Paul, Minnesota. He maintains an active clinical practice with Allina Health alongside his private practice, specializing in complex mood disorders and treatment-resistant depression. Driven by a commitment to rigorous clinical standards, Dr. Chappelle developed specialized protocols for adult ADHD assessment during his residency training to address diagnostic bottlenecks in patients without prior childhood documentation. He partners with NVOX Direct to deliver precise, high-integrity diagnostic evaluations.
Dr. Dan Cohn is a clinical and high-performance psychologist, located in Wynnewood, PA. He obtained his Master's degree in sport psychology from Temple University and his doctoral degree in clinical psychology from La Salle University, where he received training in comprehensive ADHD assessment. Dr. Cohn operates his own private practice where he provides both short and long term therapy in addition to ADHD assessment. He uses approaches grounded in ACT, CBT, and Motivational Interviewing.
Dr. Courtnie Collins is a licensed clinical psychologist and Research Assistant Professor at the University of South Carolina. She has extensive experience in cognitive, academic, developmental, and neuropsychological assessment, with a background in pediatric settings. Her work focuses on improving mental health and behavioral health outcomes for children, adolescents, and families through research, assessment, and evidence-based practice. She collaborates with educators, mental health professionals, researchers, and community partners to strengthen access to effective mental health services. Her approach emphasizes individualized, evidence-informed care that recognizes each person’s unique strengths, needs, and circumstances.
Lindsay Coyle, PhD, ABSP, QME, is a licensed psychologist with extensive experience in clinical and forensic psychology. As a Board Certified Sports Psychologist, she collaborates with athletes to enhance mental performance and achieve their goals. Dr. Coyle provides court-ordered evaluations and psychological assessments across several states, including California, Colorado, New Mexico, Florida, and Nevada. Her practice, LJC Psychological Services Group, emphasizes forensic consultation, diagnostic evaluations, and therapy for ADHD, learning issues, neurodiversity, and serious mental health issues. Dr. Coyle is also committed to advancing mental health treatment through her research at Medcase. Her work with veterans and her role as a Qualified Medical Evaluator further highlight her dedication to diverse psychological services. Additionally, Lindsay is an avid distance runner and triathlete, integrating her passion for sports into her professional expertise.
Dr. Elizabeth Goodwin is a licensed psychologist with extensive experience in psychological assessment, diagnostic evaluation, and evidence-based clinical practice. She specializes in working with adults with ADHD and related cognitive, emotional, and behavioral concerns. Her approach is compassionate, collaborative, and neurodiversity-affirming, recognizing the unique experiences, perspectives, and strengths of each individual. Dr. Goodwin is committed to expanding access to high-quality psychological assessments that foster diagnostic clarity, greater self-understanding, and meaningful insights to guide individuals in their next steps.
Dr. Marilyn Stewart Harris is a licensed Neuropsychologist with over two decades of clinical experience specializing in comprehensive neuropsychological evaluations, neuro-affirming diagnostic assessments, and interdisciplinary care. Her expertise spans pediatric through adult populations across hospital systems, school districts, community health centers, and memory clinics.
Dr. Harris evaluates individuals with complex central nervous system conditions, neurodivergent profiles (autism, ADHD), traumatic brain injuries, and developmental disabilities. Grounded in a respectful, strength-based approach, her practice partners with neurodivergent individuals and families to deliver clear answers, practical guidance, and meaningful advocacy across home, school, and healthcare settings.
Erin N. Henderson, Ph.D., is a licensed clinical psychologist with over 20 years of experience helping adolescents, adults, and seniors better understand themselves and find strategies that work in real life. She has a particular focus on ADHD and learning evaluations, helping individuals make sense of their unique strengths and challenges and understand how attention, learning, and executive functioning can affect daily life. Erin brings warmth, curiosity, and compassion to her work, creating a supportive space where people feel understood rather than judged. Her approach combines scientific expertise with practical, individualized strategies to help each person move forward with greater clarity and confidence.
Sheri is a licensed clinical and school psychologist with over 25 years of experience evaluating and supporting children, adolescents, and families. She specializes in comprehensive evaluations, with a focus on ADHD, executive functioning, autism, anxiety, social and interpersonal functioning, and other factors that can affect a child’s learning, behavior, and well-being. Sheri takes a thoughtful, collaborative, and strengths-based approach, helping families gain a clear understanding of their child’s unique profile and needs. Her evaluations provide practical, individualized recommendations designed to help children thrive at home, at school, and in their everyday lives.
Dr. Christina Mandina-DiMarco is a licensed clinical psychologist with extensive experience in psychological assessment and specialized training in neuropsychology and health psychology. She evaluates children, adolescents, and adults for neurodevelopmental conditions, cognitive concerns, and mental health conditions. Dr. Mandina-DiMarco earned her doctorate at Florida Institute of Technology and completed her postdoctoral residency at the University of Florida. Her approach integrates evidence-based assessment with an understanding of cognitive, emotional, and physical health to provide clear explanations and individualized recommendations.
Dr. Neff is a licensed clinical psychologist and board-certified neurofeedback provider in Montana with 16 years of experience. She specializes in the assessment of ADHD and other forms of neurodiversity. She is known for her comprehensive, strengths-based approach.
Dr. Kellie L. Nesto is a licensed psychologist in Nevada specializing in clinical assessment and psychological testing. She earned her Ph.D. from Fielding Graduate University, focusing her research on intellectual disabilities and behavioral risks in juvenile justice settings. Dr. Nesto’s diverse career spans state and private practice, where she provides clinical supervision, neuropsychological testing, and veteran disability evaluations. Additionally, she has extensive experience in program consultation and clinical auditing within mental health and juvenile justice systems. Dedicated to evidence-based care, her current practice focuses on thorough psychological assessment and clinical training.
Dr. Nina Parker is a Licensed Clinical Psychologist with over twenty-five years of experience in the behavioral health and social services field. She has worked across a wide range of clinical settings, including outpatient practices, private clinics, and community programs, providing support to adults, children, and families.
Dr. Parker specializes in working with individuals with Intellectual Disabilities, Autism Spectrum Disorders, ADHD, and co-occurring mental health conditions. In addition to therapy, she provides comprehensive psychological evaluations to clarify diagnoses, assess current levels of functioning, and guide meaningful, person-centered treatment planning. She is passionate about supporting and educating families and teams so that care is clinically responsible, person-driven, and meaningful.
Dr. Faun Powers is a board-certified psychiatrist with a special interest in the evaluation and care of children, adolescents, and adults with ADHD and other neurodevelopmental conditions. She earned her medical degree from the Kirk Kerkorian School of Medicine at UNLV as a member of its charter class in 2021 and completed her psychiatry residency at UNLV in 2025.
Before pursuing medicine, Dr. Powers worked as a sonographer specializing in high-risk pregnancy ultrasounds and fetal echocardiograms. Her diverse clinical background, combined with her experience as a parent of a child on the autism spectrum, has shaped her passion for understanding neurodevelopmental differences and supporting individuals and families through the diagnostic process. She is passionate about helping individuals and families better understand ADHD and other neurodevelopmental conditions so they can access the support, resources, and care they need to thrive.
Dr. Pritzl is a licensed psychologist and Board Certified Behavior Analyst–Doctoral (BCBA-D) with 20 years of experience in psychological assessment, child and adolescent development, autism, and behavioral health. She has extensive training and clinical experience working with children and families, including evaluating developmental, behavioral, emotional, and attention-related concerns. Her approach to assessment focuses on understanding each child or teen’s unique strengths and challenges, identifying factors that may affect attention, organization, and daily functioning, and providing clear, practical recommendations tailored to the individual and their family. She is committed to helping families better understand their child’s needs and identify strategies to support success at home, at school, and in everyday life. Through her PSYPACT authorization, Dr. Pritzl can provide telepsychology services to clients throughout the majority of the United States.
Dr. Maxwell Rappoport is a licensed clinical psychologist who works with adults navigating ADHD and executive-functioning difficulties, as well as those working through anxiety, depression, relationship concerns, life transitions, and other challenges that can leave people feeling stuck or overwhelmed. Dr. Rappoport helps clients better understand patterns involving and adversely affecting attention, motivation, organization, procrastination, overwhelm, and self-criticism while developing practical strategies that fit their lives. Dr. Rappoport's style is warm, curious, straightforward, and collaborative; he believes therapy works best when it feels like a genuine conversation rather than a formula. Dr. Rappoport balances practical problem-solving with deeper exploration to help clients create meaningful, sustainable change.
Dr. Laura Rencher is a licensed psychologist in Georgia with more than 25 years of experience in psychological assessment, diagnosis, and psychotherapy. She earned her master’s degree from Georgia State University and her Ph.D. from the University of Texas.
Throughout her career, she has worked with adults from diverse backgrounds, providing comprehensive psychological evaluations and individualized care. Her areas of expertise include the assessment of ADHD in adult women, with particular attention to the unique ways symptoms may present in women.
Dr. Marnie Richard is a licensed clinical psychologist with extensive experience assessing ADHD in adolescents and adults. She earned her doctorate in clinical psychology from the Hawaii School of Professional Psychology and has completed hundreds of ADHD evaluations. She takes a collaborative approach that considers each person’s developmental history, strengths, challenges, and daily experiences. Through careful assessment and clear feedback, she helps people better understand themselves and identify practical supports that fit their needs.
Dr. Scott A. Roth is a New Jersey licensed psychologist and certified school psychologist who provides psychological and psychoeducational services to children, adolescents, and adults. He utilizes a collaborative, goal-oriented, and action-focused approach grounded in empathy, trust, and a supportive therapeutic relationship. With extensive experience treating ADHD, mood and anxiety disorders, behavioral challenges, learning difficulties, and trauma-related concerns, Dr. Roth helps clients develop practical skills to improve functioning and achieve their goals. He also brings specialized expertise in court-appointed services, including custody-neutral assessments, family reunification therapy, and high-conflict case management. Dr. Roth graduated cum laude from Rutgers University and earned his master’s degree and doctorate from Rutgers’ Graduate School of Applied and Professional Psychology.
Dr. Joseph Sands is a licensed psychologist with extensive experience in psychological assessment and the evaluation of ADHD and other neurodevelopmental and mental health concerns. He has conducted comprehensive psychological and neuropsychological evaluations with children, adolescents, and adults, assessing areas such as attention, executive functioning, memory, learning, personality, and emotional functioning. He also provides therapy to clients navigating ADHD, anxiety, depression, relationships, self-esteem, and life transitions. His approach is collaborative, supportive, and individualized, combining evidence-based strategies with a focus on helping clients better understand themselves and develop practical tools for meaningful change.
Kevin Stone, Psy.D., is a licensed psychologist who has been practicing in New York since 1999, with more than 25 years of experience working with children, adolescents, and adults. He has extensive experience in psychological and neuropsychological assessment and has conducted more than 300 ADHD evaluations, using measures including the WAIS, WISC, CPT, Conners, ABAS-3, and other assessment tools. His approach integrates test results with clinical interviews, behavioral observations, developmental history, and other relevant information to develop a comprehensive understanding of each individual. Kevin places particular emphasis on making assessment findings understandable and meaningful, helping clients recognize their strengths and better understand the challenges they may be experiencing.
Dr. Mariah Streeter is a licensed clinical psychologist specializing in psychological assessment, diagnostic clarification, and integrative health psychology. Her clinical background includes neuropsychological assessment, ADHD evaluations, and working with adults presenting with complex emotional, cognitive, and medical concerns. She brings a comprehensive approach to understanding attention, executive functioning, and the ways psychological and physical health can influence cognitive performance. Dr. Streeter is committed to providing thoughtful, individualized assessments that help individuals better understand their experiences and identify meaningful next steps for treatment and support.