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  • Quarles Laboratory Staff


    Laura Bell, PhD

    Research Assistant Professor
    Neuroimaging Research

    nate semmineh professional portrait

    Nate Semmineh, PhD

    Neuroimaging Research Specialist

    Postdoctoral Fellows


    Sudarshan Ragunathan, PhD

    Postdoctoral Fellow
    Neuroimaging Research


    Matthew Scarpelli, PhD

    Postdoctoral Fellow
    Neuroimaging Research

    PhD Students


    Ethan Mathew, MS

    PhD Student



    Debbie Healey

    Laboratory Manager
    Quarles Laboratory

    lori steffes

    Lori Steffes

    Study Coordinator
    Neuroimaging Research

    About Barrow Neurological Institute
    Since our doors opened as a regional specialty center in 1962, we have grown into one of the premier destinations in the world for neurology and neurosurgery. Our experienced, highly skilled, and comprehensive team of neurological specialists can provide you with a complete spectrum of care–from diagnosis through outpatient neurorehabilitation–under one roof. Barrow Neurological Institute: Discover. Educate. Heal.