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Our Team

Dr. CohenMary Riggs Cohen, PhD

Mary Riggs Cohen, PhD, received her doctoral training in clinical psychology at the Catholic University of America and her postdoctoral family therapy training at the Philadelphia Child Guidance Center. Dr. Cohen is a licensed psychologist in New York and Pennsylvania. She has 36 years of experience working with children, adolescents, adults and families and has specialized in the diagnosis and treatment of autism spectrum disorders for 20 years.

As Clinical Director of the Social Learning Disorders Program at the University of Pennsylvania Psychiatry Department, she developed the Social Skills Seminar for young adults on the autism spectrum. The program has been taught at Penn and at various locations in the Philadelphia metropolitan area and in New York City. She is the author of Social Literacy: A Social Skills Seminar for Young Adults with ASDs, NLDs and Social Anxiety. Dr. Cohen was the Director of the Center for Teaching and Research in Autism at Pace University for 3 years and is an Associate Professor of Psychology.

She is a frequent presenter at autism conferences and provides professional continuing education workshops on a variety of topics related to autism diagnosis and treatment. She is currently Director at Autism Spectrum Diagnostics & Consulting in Doylestown, PA. Dr. Cohen consults with attorneys on issues regarding autism spectrum disorders and internet crime and has been doing forensic evaluations of incarcerated ASD individuals and providing expert testimony since 2009.


Headshot websiteBrittany Lyman, PsyD

Dr. Lyman is a licensed clinical psychologist who provides evaluation, therapy, and consultation services to individuals impacted by autism spectrum disorder (ASD).  Dr. Lyman conducts comprehensive diagnostic, psychoeducational, and neuropsychological evaluations of children, adolescents, and young adults assessing a variety of learning differences, attention and executive functioning, and/or the impact of psychological, behavioral, and/or emotional conditions on the individual. In line with the philosophy of the practice, Dr. Lyman takes a strength-based approach to both evaluation and treatment and strives to create a relationship with the individual and family that includes trust, respect, and acceptance.

 She has expertise in working with individuals with ASD across the life span and their families. Her philosophy is that ASD is a diagnosis that impacts not only the individual but also the entire family. Dr. Lyman has a specific interest in the parental experience in raising a child with ASD and more specifically the stigma experienced by those impacted by ASD. Dr. Lyman has worked closely with families following a child’s diagnosis by providing specific treatment recommendations and a roadmap as they navigate the journey of raising a child with ASD. She also is interested in providing consultation and education to the broader community about ASD and the great strengths and skills the ASD population can offer a community.

 Dr. Lyman received her B.S. from Virginia Polytechnic Institute and State University. She then received her M.S. from Drexel University before earning her M.A. and Psy.D. in Clinical Psychology from La Salle University with a concentration in Child and Family. She completed her internship at the May Institute and her postdoctoral fellowship at the Lurie Center at Massachusetts General Hospital where her training focused intensely on the evaluation and treatment of individuals with ASD.

 Dr. Lyman has extensive training in the implementation and adaptation of Cognitive Behavioral Therapy (CBT) for individuals on the autism spectrum. She also received training and collaborated with the founder of Lego®-Based Therapy, Dr. Daniel Legoff, in promoting social competence in individuals with ASD. Dr. Lyman also serves as an Adjunct Professor at La Salle University in the clinical doctoral program. She is licensed in both Pennsylvania and Delaware. 


Bryans Headshot Bryan Peightal, MS

Bryan Peightal is a fifth year doctoral student in Chestnut Hill College's Clinical Psychology program.  Bryan has a vast array of clinical experience, working in residential, community mental health, school districts, college counseling centers, and home-based settings.  He has worked with children, adolescents, and their families for over five years.  Bryan's clinical interests include anxiety, depression, trauma, and autism--all while trying to understand how these are influenced by family systems.  His dissertation research investigates how single parents of adult children with autism experience their unique circumstances.  In addition, Bryan also serves as an adjunct professor in Chestnut Hill College's undergraduate department.  



Marias picMaria Maddalo, PsyD

 Dr. Maddalo is a Nationally Certified School Psychologist with over 12 years of experience working in various school settings.  Dr. Maddalo completed her doctorate in School Psychology at the Philadelphia College of Osteopathic Medicine in 2015.  As part of that program, Dr. Maddalo obtained diplomate status from the American Board of School Neuropsychology.  Dr. Maddalo specializes in the evaluation of children using a neuropsychological perspective and applying that perspective to learning and performance within the classroom setting.

 Dr. Maddalo is passionate about the appropriate assessment and diagnosis of children on the Autism Spectrum. She completed a practicum at the Children’s Hospital of Philadelphia Center for Autism Research, where she trained in the use of the Autism Diagnostic Observation Schedule, Second Edition.  During her time at CHOP, Dr. Maddalo assisted with assessment and data collection on the cognitive profiles of children with Autism.  Dr. Maddalo understands the challenges that go along with a diagnosis of Autism across all levels of functioning.

Dr. Maddalo has practiced as a Board Certified Behavior Analyst since 2005, and received training in Cognitive Behavior Therapy during her time at PCOM.  Dr. Maddalo combines Applied Behavior Analysis and Cognitive Behavior Therapy to offer consultation to families and support to children and adolescents on the Autism Spectrum.


Megan PerrinMegan Perrin, PhD

Dr. Perrin is a Licensed Clinical Psychologist with 10 years of specialized training in Neuropsychology.  She specializes in diagnostic evaluation of Learning and Developmental disabilities, Attention Deficit Hyperactivity Disorder (ADHD), Autism Spectrum Disorders (ASD) and neurological illness.  She also often works with individuals whose functioning is impacted by psychiatric illness, including depression, anxiety and psychosis.   Dr. Perrin’s evaluations are typically used to inform treatment planning or to support disability, educational or professional accommodation applications. 

Dr. Perrin prides herself on her personalized approach to diagnostic evaluation.   She works with each client and their family to gain a better understanding of their difficulties.  She relies on sound, scientifically validated measures of cognition, mood and personality to improve her understanding of their functional limitations and to inform diagnosis.  Dr. Perrin utilizes her expertise in psychiatric and neurological illness, while taking into consideration each individual’s unique circumstances and presenting concerns, to inform treatment recommendations.   She is dedicated to advocating for her patients to ensure that they receive adequate care, as well as the educational and professional accommodations they need to succeed and live happy lives.

Dr. Perrin completed her doctoral training in Clinical Neuropsychology at the City University of New York, Queens College in 2013.   She received formal training in neuropsychological evaluation at Columbia University’s Comprehensive Epilepsy Center and completed a three-year Clinical Neuropsychology postdoctoral residency at University of Pennsylvania’s Perelman School of Medicine in the Department of Psychiatry.   She is also certified in the administration of the Autism Diagnostic Observation Schedule, the gold standard in diagnostic evaluation of ASD. 

Over the course of her career, working with hundreds of individuals with complex psychiatric and neurological illness, Dr. Perrin has developed an acute understanding of the profound impact that emotional and cognitive difficulties can have on an individual and their loved ones.  She dedicates her career to providing accurate diagnostic evaluation because she firmly believes that it is a crucial step in healing and improving the lives of her clients.