Justiss Kallos, MD

Mark Weidenbaum, MD, specializes in treating a broad range of spinal disorders in both adults and children, including spinal deformity, arthritis, trauma, tumors, instability, and degenerative conditions. His surgical procedures range from minimally invasive and microsurgical approaches to complex spinal reconstructions. Dr. Weidenbaum is active in basic science as well as in clinical research and has published numerous scientific articles in peer-reviewed journals. He is particularly interested in spinal deformity and degeneration and travels regularly to participate in scientific exchanges as well as in care for patients with challenging conditions. Dr. Weidenbaum also holds leadership roles in national and international spine surgery organizations.

Clark Smith, MD, MPH, FAAPMR is an Associate Professor of Rehabilitation and Regenerative Medicine at Columbia University Vagelos College of Physicians and Surgeons in New York City. He specializes in treating patients with acute and chronic sports and spine injuries. Dr. Smith is board certified in both Physical Medicine & Rehabilitation and Pain Medicine. He completed his undergraduate education at Duke University, received his M.D. and Masters of Public Health (M.P.H.) from Tulane University, underwent residency training in Physical Medicine and Rehabilitation at Emory University where he also served as Chief Resident, and completed a multidisciplinary pain medicine fellowship at Northwestern University and the Rehabilitation Institute of Chicago. Dr. Smith has a special interest in pain and sports medicine. He uses a multidisciplinary non-operative approach to treating acute and chronic sports and spine problems. Depending on the scope and severity of the problem, treatment options may include individualized therapy programs, medications, or non-operative interventional procedures targeted at a particular injury or problem. Procedures that Dr. Smith performs include: ultrasound and fluoroscopically guided joint injections, Platelet Rich Plasma (PrP), spine injections, epidural steroid injections, radiofrequency ablation, and many others. The goals of Dr. Smith’s treatment are to help every patient achieve his or her highest level of performance and function. Dr. Smith sees patients at CUMC's main campus at 180 Ft. Washington Ave, Suite 199, HP 182, and at CUMC's midtown campus at 51 W 51st st. between 5th and 6th ave., 3rd Floor. Call 212-305-3535 for an appointment.

Lauren Ernberg, M.D. is a board-certified radiologist with specialization in Musculoskeletal Radiology. She is an Assistant Professor of Clinical Radiology at Weill Cornell Medicine and an Assistant Attending Radiologist at the NewYork-Presbyterian Hospital/Weill Cornell Medicine Campus.Dr. Ernberg graduated Magna Cum Laude with a B.S. from Brown University in Providence, Rhode Island in 1992. She later earned her M.D. in 1997 from Cornell University Medical College, New York, NY. Following an internal medical internship at Pennsylvania Hospital, Philadelphia, PA, Dr. Ernberg trained as a resident in Diagnostic Radiology at NewYork-Presbyterian Hospital, New York, NY, from 1998 to 2002. In 2003, she completed her fellowship in Musculoskeletal MRI at the Hospital for Special Surgery, New York, NY.Dr. Ernberg joined the faculty at Weill Cornell Medicine in October 2025 as an Assistant Professor of Clinical Radiology, as a member of the Musculoskeletal Division.Dr. Ernberg is a member of the following radiological societies: American College of Radiology (ACR)Radiological Society of North America (RSNA)