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Hilarie C Tomasiewicz, MD, PhD Email Hilarie Tomasiewicz

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    • Positions
    • ASSISTANT PROFESSOR | Neurosurgery
    • ASSISTANT PROFESSOR | Neuroscience
    • Specialty
    • Neurosurgery
    • Language
    • English
    • Hospital Affiliations
    • Mount Sinai Queens
    • Mount Sinai Brooklyn
    • Mount Sinai Beth Israel
    • Mount Sinai Morningside and Mount Sinai West
    • The Mount Sinai Hospital
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Dr. Hilarie Tomasiewicz is a neurosurgeon who specializes in functional neurosurgery. She is an Assistant Professor of Neurosurgery, Neurology, and Neuroscience at the Icahn School of Medicine at Mount Sinai and Director of the Neurosurgical Pain Program at the Mount Sinai Health System. She also serves as Site Chief of Neurosurgery at Mount Sinai Queens. Dr. Tomasiewicz has extensive training in the care of patients with movement disorders, seizures, and chronic pain. Her specialized clinical interests include deep brain stimulation for neuropsychiatric disorders, as well as neuromodulation, epilepsy, and global neurosurgery. Her research interests are directed towards understanding how experience affects behavior and the biology of the brain, with a specific interest in how exposure to addictive drugs mediates alterations in brain reward circuitry contributing to addictive behavior.

Dr. Tomasiewicz attended the Massachusetts Institute of Technology as an undergraduate, where she majored in biology and minored in brain and cognitive science. She received both her medical degree and her doctoral degree in neuroscience from the Icahn School of Medicine at Mount Sinai in New York City, where she was invited to join the Alpha Omega Alpha honor society. Dr. Tomasiewicz completed her residency training in neurological surgery at New York-Presbyterian/Weill Cornell Medical Center and Memorial Sloan Kettering Cancer Center, where she was recognized for her exceptional patient care. As a resident intern at Weill Cornell, she was honored with their Shining Star Award, and as a chief neurosurgery resident, she was honored with their House Staff Award for Neurological Surgery.

Dr. Tomasiewicz’s subsequent, specialized fellowship training in stereotactic and functional neurosurgery at Emory University Hospital provided her with additional expertise in the current techniques of functional neurosurgery, specifically selective laser and radiofrequency ablation for epilepsy, responsive neurostimulation, robotic-assisted stereotactic EEG, the use of multiple DBS platforms for a variety of neurologic and psychiatric disorders, as well as lesioning and neuromodulatory procedures for chronic pain.

Dr. Tomasiewicz has published multiple high-impact, peer-reviewed scientific publications and presented her work at both national and international neuroscience conferences. Briefly, Dr. Tomasiewicz spent three years investigating the behavioral genetics of drug addiction at McLean Hospital/Harvard Medical School prior to earning her medical and doctoral degrees at the Icahn School of Medicine at Mount Sinai. Her doctoral work on adolescent drug use at Mount Sinai uncovered a novel epigenetic mechanism by which cannabis acts in the brain to impact adult substance abuse vulnerability, and she was awarded a five-year NIH F30 NRSA grant to support this research. Her postdoctoral work at Cornell was focused on the design of a novelviral gene therapy allowing for both optogenetic control and molecular profiling of neuronal ensembles activated by cocaine.

Throughout her clinical career, Dr. Tomasiewicz has remained passionate about global neurosurgery and has participated in multiple international surgical missions to Ecuador, Bolivia, and the Dominican Republic, most recently traveling to Tanzania with a team from Cornell that focused on the neurosurgical treatment of pediatric patients with hydrocephalus and neural tube defects.

In her spare time, Dr. Tomasiewicz enjoys spending time with her family, design, creative writing, traveling, and culinary exploration.

Clinical Focus

  • Cancer Pain Syndromes
  • Deep Brain Stimulation (DBS)
  • Dystonia
  • Epilepsy
  • Facial Pain
  • Hydrocephalus
  • Movement Disorders
  • Pain
  • Parkinson's Disease
  • Responsive Neurostimulation (RNS)
  • Seizure Disorder
  • Spasticity
  • Vagal nerve stimulator (VNS) for epilepsy


MD,PHD, Mount Sinai School of Medicine

Residency, Neurological Surgery
New York Presbyterian - Weill Cornell

Fellowship, Stereotactic Neurosurgery
Emory University School of Medicine