​Dr. Barry Ekdom, Ph.D.
​Clinical Neuropsychologist

​​Dr. Ekdom earned his Ph.D. at the University of Iowa, then trained for two years in Clinical Neuropsychology at the Department of Neurology at North Shore University Hospital, a Cornell affiliate, at Georgetown University Hospital. After three years at a local neurological clinic, Dr. Ekdom began his independent practice and became an adjunct faculty member at the George Washington Medical School, Department of Neurological Surgery. For over twenty years, Dr. Ekdom has been committed to and specialized in high quality diagnostic assessment and consultation with persons three years of age through the elderly. Dr. Ekdom's professional affiliations include the International Neuropsychological Society, the National Academy of Neuropsychology, the American Psychological Association, the International Dyslexia Association, and the Epilepsy Foundation.

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Dr. Nicole Hashemian, Psy.D.
Clinical Neuropsychologist

​Dr. Hashemian earned her Masters and Doctorate degrees in Clinical Psychology at the American School of Professional Psychology and has broad experience working with individuals with a wide variety of mental health disorders. Her clinical training includes a post-doctoral fellowship in neuropsychology and doctoral externships at the world-renowned Children’s National Medical Center. Dr. Hashemian has presented on topics such as trauma and abuse, assessing and treating eating disorders, models of implementing behavioral healthcare, nurturing motivation and resilience in children with ADHD, and memory concerns and dementia in elderly populations. Her research interests include concussions, ADHD, and childhood neurodevelopmental disorders. She is well-versed in working with culturally diverse populations and is fluent in Persian (Farsi). She is a member of the American Psychological Association (APA) and its Division of Clinical Neuropsychology.

Dr. Michelle Sullivan-Gast, Psy.D.
Clinical Neuropsychologist

​Dr. Sullivan-Gast earned her Psy.D. in clinical psychology at the American School of Professional Psychology. She trained in neuropsychology at Walter Reed Army Medical Center prior to completing an internship and post-doctoral training in a private practice setting. Dr. Sullivan-Gast has extensive experience working with individuals of all ages, from the very young to the elderly. She is a licensed psychologist in the state of Virginia and has been with the practice since 2009.  

Dr. Ranon Cortell, Ph.D.
Clinical Psychologist

Dr. Cortell is a licensed psychologist in Maryland and a member of the American Psychological Association.  He received his Ph.D. in clinical psychology from The Catholic University of America and completed his pre-doctoral internship at the Woodburn Center for Community Mental Health where he worked with clients of all ages and varied cultural backgrounds. Dr. Cortell conducts psychological assessments to evaluate learning, attention, emotional, and behavioral challenges and provide appropriate recommendations. He works with children, adolescents, and adults, providing individual and family therapy and psychological assessment. 

Denise Krantz, M.S.
​Head Psychometrist

Denise graduated from The College of St. Rose with a Master’s Degree in Educational Psychology. Prior to joining the practice in 2015, Denise worked on several research projects examining early childhood education programs in Washington, DC public and private schools. In her current role, she works with patients of all ages administering accurate assessments while ensuring that the testing process is an enjoyable one.

Rachel Stewart, B.S.
​​Testing Technician

Rachel graduated from James Madison University with a B.S. in Psychology. She is currently pursuing a Master’s degree in Clinical Mental Health Counseling at Marymount University. Her past experience includes working with children, adolescents, and young adults with various mental disorders and disabilities such as Autism Spectrum Disorder, ADHD, and behavioral issues. One of Rachel’s interests is exploring the impact of cultural influences on individuals and their families. One of her favorite travel experiences has been participating in a cross-cultural psychology study abroad program in Perugia and Florence, Italy. In her current role, she is training in specialized neuropsychological testing, psycho-educational testing, and patient care. Rachel is excited to expand her professional knowledge in the fascinating field of neuropsychology.

Kayla Kaiser, B.A.
Front Office Administrator

Kayla is the office administrator for the Ekdom Neuropsychology Group. She has over six years of experience in medical administration and enjoys interacting with and creating relationships with our patients. Kayla is here to help build a bridge between you and your clinician and make sure your experience with the Ekdom Neuropsychology Group meets (and hopefully) exceeds your expectations. Kayla received a Bachelor’s of Visual Art and Technology from George Mason University and is an avid designer in her free time. She can often be found creating logos, baking masterpieces, rock hunting and photographing vegetables.