School of Medicine


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  • Ryan Taylor, MD

    Ryan Taylor, MD

    Clinical Assistant Professor, Neurology & Neurological Sciences

    BioDr. Taylor is a fellowship-trained neurologist and assistant professor in the Department of Neurology and Neurological Sciences, Memory Disorders Division. He provides patient care at the Stanford Center for Memory Disorders.

    His areas of expertise include diagnosing and treating illnesses that impair thinking, memory, behavior, and speech. Dr. Taylor’s clinical focus includes Alzheimer’s disease, Lewy body disease, frontotemporal dementia, primary progressive aphasia, posterior cortical atrophy, Creutzfeldt-Jakob disease, autoimmune encephalitis and other rapidly progressive dementias. He works with patients and families to provide diagnostic clarity and individualized treatment plans.

    Dr. Taylor’s academic and research interests combine clinical and scientific understandings of dementia with a philosophical inquiry into the structure of conscious experience. His original clinical research includes diverse topics, such as advances in diagnosing Creutzfeldt-Jakob disease and the clinical characterization of adult-onset hereditary dementias. Dr. Taylor has published work instrumental in identifying the potential role of fentanyl in a syndrome of sudden onset amnesia that emerged during the opioid crisis.

    He has presented research at the American Academy of Neurology and published in peer-reviewed journals, including the Canadian Journal of Neurological Sciences and Methods in Molecular Biology. He has also published a chapter on the diagnosis and treatment of frontotemporal dementia and was a reviewer for Neurocase.

    Dr. Taylor is a fellow of the Royal College of Physicians of Canada. He has taught residents and medical students clinical skills, neuroanatomy, neuro-imaging, and other subjects. He also has delivered Grand Rounds presentations on dementia, epilepsy, and pediatric neurology.

  • Kate Therkelsen, MD

    Kate Therkelsen, MD

    Clinical Assistant Professor, Neurology & Neurological Sciences

    BioDr. Therkelsen is a board-certified, fellowship-trained neuro-oncologist with the Stanford Medicine Cancer Center and a clinical assistant professor in the Department of Neurology and Neurological Sciences.

    She diagnoses and treats a wide range of conditions including primary brain tumors and cancers of the central nervous system, metastatic disease to the brain and spinal cord, and neurologic complications of cancer. She prepares a personalized, comprehensive care plan for each patient she serves.

    Dr. Therkelsen’s research interests include clinical trials of new therapeutics, as well as ways to reduce toxicities that some patients may experience when receiving cancer treatment. Her fellowship research projects included a study of survival and long-term function among patients treated for primary central nervous system lymphoma. She also received a pre-doctoral National Institutes of Health Intramural Research Training Award for her work with the Framingham Heart Study.

    She has published in Current Treatment Options in Oncology and other peer-reviewed journals. She has presented to her peers at international, national, and regional meetings, including the annual meetings of the Society of Neuro-Oncology and of the American Academy of Neurology.

    Dr. Therkelsen is a member of the Society of Neuro-Oncology and the American Academy of Neurology.

  • Reena Thomas, MD PhD

    Reena Thomas, MD PhD

    Clinical Associate Professor, Neurology & Neurological Sciences
    Clinical Associate Professor (By courtesy), Neurosurgery

    Current Research and Scholarly Interests-Neuro Oncology Immunotherapy
    -Health Equity
    -Medical Education

  • Zachary David Threlkeld

    Zachary David Threlkeld

    Clinical Associate Professor, Neurology & Neurological Sciences
    Clinical Associate Professor (By courtesy), Neurosurgery

    BioDr. Threlkeld cares for critically ill patients with acute neurologic illness, including traumatic brain injury, stroke, intracerebral hemorrhage, and epilepsy. He completed his residency training in neurology at the University of California, San Francisco, and joined the Stanford Neurocritical Care program after completing fellowship training in neurocritical care at Massachusetts General Hospital and Brigham and Women’s Hospital in Boston. He has a particular clinical and research interest in traumatic brain injury. His research uses advanced imaging modalities like functional magnetic resonance imaging (fMRI) to better understand disorders of consciousness.

  • Alexandra Nicole Trelle

    Alexandra Nicole Trelle

    Instructor, Neurology & Neurological Sciences

    BioI completed my undergraduate degree at the University of Toronto, and my PhD at the University of Cambridge. My work explores the neural mechanisms supporting episodic memory, and how these are affected by aging and Alzheimer's disease. I am currently leading the Stanford Aging and Memory Study, a large-scale longitudinal project examining individual differences in episodic memory in older adults. My research combines structural and functional MRI, PET imaging, and analysis of molecular and genetic risk factors for Alzheimer's disease.