December 2025

NEUROSCIENCES

NORTHWESTERN MEDICINE NEUROSURGERY WELCOMES NEW FACULTY IN 2025

In 2025, we proudly welcomed three outstanding neurosurgeons to the Department of Neurological Surgery at Northwestern Medicine. Their clinical expertise and dedication to innovation will strengthen our patient care and advance our academic mission.
Ali A. Baaj, MD
Professor of Neurosurgery
Vice Chair, International Outreach
Director, Innovation and Technology in Spine Surgery
Director, Spine Surgery Fellowship Program

Ali A. Baaj, MD, earned his medical degree from Boston University. He completed his general surgery internship and complex oncology and deformity spine fellowship at Johns Hopkins University, and his neurosurgery residency at University of South Florida Morsani.
 
Dr. Baaj specializes in complex spine surgery and brings a wealth of expertise in both traditional and minimally invasive techniques for treating spinal degenerative disease, trauma, tumors and scoliosis in both adults and adolescents. He is focused on advancing less invasive approaches through technology, including computer-assisted surgery and robotics. Dr. Baaj is currently seeing patients at Northwestern Memorial Hospital.

Learn more about Dr. Baaj.
​Constantine Karras, MD
Clinical Assistant Professor of Neurological Surgery

Constantine Karras, MD, completed his medical degree and fellowship in skull base neurosurgery at Ohio State University, and his residency training at Northwestern Medicine. His clinical interests include general and cranial neurosurgery. Dr. Karras is based at Northwestern Medicine Central DuPage Hospital.
Arjang Ahmadpour, MD
Clinical Assistant Professor of Neurological Surgery

Arjang Ahmadpour, MD, earned his medical degree from University of California at Davis and completed his neurosurgery residency at University of Chicago, followed by a spine fellowship at University of California in Los Angeles. His clinical interests focus on various spinal conditions, including tumors, congenital issues, deformities, degenerative diseases and trauma. Dr. Ahmadpour is currently seeing patients at Northwestern Medicine McHenry Hospital.

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