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Aaron A. Cohen-Gadol (born November 23, 1970) is an internationally renowned and innovative American neurosurgeon specializing in surgical treatment of brain tumors and aneurysms. He is currently a professor in the department of neurosurgery at Indiana University School of Medicine and a member of Goodman Campbell Brain and Spine. He was selected as one of the most effective 100 neurosurgeons in the United States by the prestigious American Academy of Neurological Surgery. He is one of the few surgeons in the United States who performs removal of complex brain tumors via endoscopic techniques, which use the natural nasal pathways instead of opening the skull. This technique patients with more effective surgeries and faster recovery. He has contributed to the refinement of intraoperative fluorescent technologies to maximize removal of brain tumors and improve patients' survival. The fluorescent technology causes the brain tumor to "glow," enabling the surgeon to detect invisible margins of the tumor. Dr. Cohen-Gadol is also the creator and president of The Neurosurgical Atlas, a web-based learning resource for neurosurgical operations. Within 6 months of its introduction and by December 2016, The Neurosurgical Atlas has served a total of over 4200 national and international neurosurgeon/resident members and an average of 600 viewers per day. This Atlas is the most trusted and comprehensive resource for learning complex brain operations in the world. This Atlas reflects the surgical experience of Dr. Cohen with over 4000 brain operations. Dr. Cohen is also involved in guiding and teaching fellow neurosurgeons in handling complex surgical procedures including brain tumors, aneurysms and arteriovenous malformations. As of 2014, he is the Director of Neurosurgical Oncology/Brain Tumor Surgery at the Indiana University Department of Neurosurgery. Dr. Cohen-Gadol serves as the associate editor of Neurosurgical Focus, a highly reputable journal in the field of neurosurgery.