Founder

Dr. Martin A. Goldstein is a nationally recognized leader in cognitive and behavioral neurology, known for pioneering integrated approaches to brain health. As the founder of Cognitive Medicine P.C., he brings decades of experience in academic medicine, clinical innovation, and interdisciplinary care to this program.

  • Founder & Medical Director

    Dr. Goldstein is board-certified in both Neurology and Psychiatry, and holds sub-specialty certification in Behavioral Neurology and Neuropsychiatry. A graduate of the College of Arts and Sciences of Cornell University, he earned his Medical Doctor degree from the State University of New York School of Medicine at Stony Brook. Dr. Goldstein completed his internship in Internal Medicine, and residency training in both Neurology and Psychiatry, at The New York Hospital – Cornell Medical Center. He was the Ronald Coles Fellow in Neuropsychiatry at Harvard Medical School, and completed fellowship training in brain imaging under an NIH training grant in the Functional Neuroimaging Laboratory of the Weill Cornell Medical College.

    Dr. Goldstein served as Attending Neurologist at The Mount Sinai Hospital in New York City from 2004 through 2018. He was the founding director of the Center for Cognitive Health at the Mount Sinai School of Medicine. Identified as a strategic initiative by the medical school, Dr. Goldstein built an inter-disciplinary program composed of neurologists, neuropsychiatrists, neuropsychologists, and other subspecialists bridging across multiple brain-focused departments. The program’s architecture thereby enabled formation of a central portal for cognitive patient care, training, and research missions.

    Beginning in 2005, Dr. Goldstein’s program was one of the earliest in New York City to focus on the neuropsychiatry of neuromodulation, including deep brain stimulation (DBS). In 2013, Dr. Goldstein’s group was the first in New York State to deploy amyloid-PET brain scan imaging for diagnostic clarification of suspected Alzheimer’s Disease.

    As an Associate Professor at the Mount Sinai School of Medicine, Dr. Goldstein served as Director of Medical Student Education in Neurology from 2007-2012. He launched a newly-developed Fellowship in Behavioral Neurology and Neuropsychiatry, earning accreditation from the United Council for Neurologic Subspecialties in 2015.

    In 2021, Dr. Goldstein was recruited to the Hospital for Special Surgery in New York City as Director of Cognitive Health and Non-Invasive Neuromodulation to develop programs focused on the intersection of cognition and motor performance.

    Dr. Goldstein’s research focus is emotional modulation of cognitive control, including the application of fMRI to identify neural mechanisms of the interaction of emotion and cognition. He has published multiple neuroscientific research articles and book chapters.

    Dr. Goldstein is a Diplomate of the American Board of Psychiatry and Neurology (ABPN), and a Diplomate of the United Council of Neurologic Subspecialties (UCNS). He is a member of the American Academy of Neurology, American Neuropsychiatric Association, and Cognitive Neuroscience Society, and is a Fellow of the American Psychiatric Association.

    By peer-selection, Dr. Goldstein has been recognized by New York Magazine Best Doctors in 2024, 2023, 2021, 2019, 2018, 2016, and 2015, and has been identified as a Castle Connelly Top Doctor since 2014. He is the recipient of multiple medical school faculty (Cornell Medical College, Mount Sinai School of Medicine) and national (e.g., American Academy of Neurology) awards for teaching excellence. Dr. Goldstein has received >$2 million in philanthropic grant support for program development across academic medical centers and the New York Center for the Advancement of Cognitive Brain Health.

    Dr. Goldstein grew up in New York City. Outside of work, he is better known as Sam & Liesl’s Dad.

Medical Team Our medical team brings together specialists in neurology, psychiatry, neuropsychology, nutrition, and care coordination to deliver integrated, personalized care.

  • Clinical Neuropsychologist

    Dr. Amanda Hahn-Ketter is a licensed clinical neuropsychologist specializing in the assessment and treatment of individuals with cognitive, emotional, and neurological challenges across the lifespan. With a doctorate in clinical psychology and advanced training board certification in neuropsychology, Dr. Hahn-Ketter brings deep expertise in evaluating attention, memory, executive functioning, and mood in the context of complex medical, and neurological, and psychiatric conditions.

    She has a particular interest in helping patients understand the interaction between brain function and behavior, and in using comprehensive diagnostic insights to guide personalized care strategies. Her work integrates evidence-based assessment tools with compassionate, patient-centered communication to empower individuals and families with actionable understanding.

    Dr. Hahn-Ketter’s experience includes hospital-based neuropsychological consultation, rehabilitation-centered care, and outpatient cognitive evaluations. At Cognitive Medicine, she plays a key role in shaping individualized treatment plans and in collaborating across disciplines to support cognitive health, recovery, and optimization.

  • Physician Associate, Functional Medicine & Neuro-Nutrition

    Diana Dou is a board-certified Physician Associate with a specialty in digestive health and neuro-nutrition. At Cognitive Medicine, she uses a systems-based approach to uncover and treat the root causes of cognitive and digestive dysfunction—bridging the gut-brain connection through personalized, integrative care.

    With over a decade of experience in gastroenterology, Diana combines advanced diagnostic tools, evidence-based nutrition, and a deep commitment to root-cause healing. Her approach is shaped not only by clinical expertise but also by personal experience: after years of struggling with migraines, IBS, and chronic fatigue, she now brings that insight to support patients seeking lasting wellness.

    Diana earned her Master’s degree from the Weill Cornell Medical College Physician Assistant Program and is the author of A GPS for Bariatric Success. She blends holistic insight with clinical precision to help patients restore cognitive clarity, energy, and long-term vitality.

  • Artemis Program Director

  • Epileptologist & Neuroendocrine Specialist

    Dr. Cynthia Harden is a board-certified neurologist with subspecialty expertise in epilepsy, clinical neurophysiology, and women’s neuroendocrine health. She brings decades of experience in academic medicine and clinical leadership to Cogmed, having directed epilepsy programs at top institutions including Mount Sinai, Weill Cornell, and Northwell Health.

    Dr. Harden is nationally recognized for her pioneering research on the intersection of epilepsy and women’s reproductive health. Her work has helped establish that epilepsy functions as an endocrine disruptor and that hormonal balance can play a critical role in seizure control. She is a founding board member of My Epilepsy Story and a passionate advocate for advancing care in often-overlooked areas such as menopause, bone health, and sexual wellness in women with epilepsy.

    A graduate of the University of Wisconsin School of Medicine, Dr. Harden completed her neurology training at Mount Sinai and her fellowship in clinical neurophysiology at Albert Einstein College of Medicine. She has published extensively and served in leadership roles within the American Epilepsy Society and the American Academy of Neurology.

  • Machela Singer is a licensed clinical social worker with a background in mental health counseling, care coordination, and patient advocacy. At Cognitive Medicine, she provides integrative support for individuals and families navigating complex neurological and psychiatric conditions, with a focus on psychosocial well-being and continuity of care. Machela practices from a multidimensional perspective while using a variety of treatment strategies including Self Psychology, CBT, DBT and EMDR.

    Machela firmly believes in the power of the therapeutic relationship and provides a safe, non-judgmental space for clients to develop self-awareness in themselves as well as in other relationships. She also facilitates skill building to help clients incorporate the changes that they want to accomplish. She focuses on the client’s strengths, fostering resilience and empowering the client towards self-actualization. 

    Drawing on her training in clinical social work and her experience in both outpatient and multidisciplinary settings, Machela helps bridge communication between patients, caregivers, and the clinical team. Her work ensures that treatment plans align with each patient’s lived experience, values, and goals—especially in the face of cognitive or emotional challenges.

    Machela has treated individuals suffering from anxiety, depression, executive functioning deficits and relationship difficulties. She has worked with people from a variety of cultures and understands the importance of practicing in a culturally competent manner.

    Machela has had training in CBT, DBT, EMDR and Grief & Bereavement and is committed to whole-person care that emphasizes empathy, empowerment, and long-term support.

Administration Our executive and operations management team ensures that every aspect of care at Cognitive Medicine is supported with precision, coordination, and compassion.

  • Olesya is the CEO of Cognitive Medicine P.C. overseeing strategic planning, program development, and cross-domain coordination to ensure the practice delivers seamless, patient-centered care. With a background in management consulting and a strong foundation in business strategy, Olesya brings a systems-oriented approach to healthcare administration.

    She holds an MBA from the University of Virginia Darden School of Business and has experience working with global organizations to improve operational efficiency and team performance. At Cognitive Medicine, Olesya plays a key role in aligning clinical excellence with organizational effectiveness, supporting both the care team and the patients they serve.


  • Nataliya Krul serves as the Chief Operating Officer of Cognitive Medicine PC. Natalia oversees all aspects of day-to-day administration and logistics. With a strong foundation in healthcare operations and patient services, she ensures that both staff and patients experience a welcoming, efficient, and well-coordinated environment.

    Nataliya brings over a decade of experience in administrative management, with a focus on team coordination, systems implementation, and process optimization. At Cognitive Medicine, she supports clinical workflow, manages scheduling and communications, and helps maintain the high standards of care that define the practice.

    She earned her Bachelor of Arts in Business Administration and Management from the City University of New York in 2013.