School of Medicine


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  • Marie Hollenhorst, MD, PhD

    Marie Hollenhorst, MD, PhD

    Clinical Instructor, Pathology

    Bio Dr. Hollenhorst is a physician and scientist with expertise in non-malignant hematology, transfusion medicine, and chemical biology. Dr. Hollenhorst values the one-on-one relationships that she forms with her patients, and strives to deliver the highest quality of care for individuals with blood diseases. Her experience caring for patients drives her to ask scientific questions in the laboratory, where she aims to bring a chemical approach to the study of non-malignant blood disease.

    Dr. Hollenhorst pursued combined MD and PhD training at Harvard University, where she received a PhD in Chemical Biology under the mentorship of Professor Christopher T Walsh. She subsequently completed a residency in Internal Medicine at Brigham and Women's Hospital, a fellowship in Transfusion Medicine at Harvard Medical School, and a fellowship in Hematology at Stanford.

    Dr. Hollenhorst has a particular interest in the biology of platelets, which are cellular fragments that help the blood to maintain a healthy balance between excessive bleeding and excessive clotting. Working in the laboratory of Professor Carolyn Bertozzi of Stanford Chemistry, Dr. Hollenhorst is studying sugar-containing molecules that are found within platelets and are important in controlling their function and lifespan.

    Dr. Hollenhorst's research is supported by a Stanford Chemistry, Engineering & Medicine for Human Health Physician-Scientist Fellowship, a National Institutes of Health Individual Postdoctoral Fellowship, and a National Blood Foundation Early-Career Scientific Research Grant.

  • Dikran Horoupian

    Dikran Horoupian

    Professor (Clinical) of Pathology, Emeritus

    Current Research and Scholarly Interests Neuropathology of:
    1. Neurodegenerative diseases
    2. Neurodevelopmental disorders
    3. CNS neoplasms
    4. Nerve & muscle diseases

  • Brooke Howitt

    Brooke Howitt

    Assistant Professor of Pathology at the Stanford University Medical Center

    Bio Dr. Howitt is a gynecologic and sarcoma pathologist, with academic interests in gynecologic mesenchymal tumors and morphologic and clinical correlates of molecular alterations in gynecologic neoplasia.

  • Chris C.S. Hsiung

    Chris C.S. Hsiung

    Instructor, Pathology

    Bio Chris Hsiung, M.D., Ph.D., is a physician-scientist developing and applying functional genomics methods for studying cell fate plasticity in normal and diseased tissues.

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