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This historical account reviews the course and lasting impact of Dr. Louise Eisenhardt (1891-1967) in neurosurgery.The writing of this project was sparked by the discovery of original scientific and bibliographical information about Eisenhardt, testimony on personal relationships, and viewpoints after comprehensive compilation of information. It is a thorough review of literature on Eisenhardt and reflects the scope and depth of these prior works.It begins with the decisive influence of Harvey Cushing's mentorship and academic; follows Eisenhardt's impact on the development of modern neuropathology; discusses the Eisenhardt-Percival-Bailey-Cushing collaboration on gross brain specimens and histological classification of brain tumors; recounts Cushing's creation of a neuropathologist team for the Brain Tumor Registry working asynchronously with the Pathology Department at Peter Bent Brigham Hospital; Eisenhardt's aid in the development of intraoperative analysis of brain tumors; her career as a neuropathologist; her contributions as Editor-in-Chief of the Journal of Neurosurgery; and her preservation of the Brain Tumor Registry at Yale University School of Medicine estimated the largest and most valuable databank of information in the history of medicine. Eisenhardt served as President, Historian, and Secretary-Treasurer of the Harvey Cushing Society, the professional organization now known as the American Association of Neurological Surgeons, and was senior lecturer for members of the Congress of Neurological Surgeons, constituents of NEUROSURGERY Publications.Our article provides glimpses into the personality of Dr. Louise Eisenhardt and her marked impact on neurosurgery and allied neurosciences.