Sumeer Lal, MD, is a board-certified neurosurgeon at Greenwood-based South Carolina Spine Center, which is part of Self Regional Healthcare in Greenwood.

Uri M. Ahn, MD, is a board-certified orthopedic spine surgeon at New Hampshire NeuroSpine Institute in Bedford.

Mohamed Abdulhamid, MD, is a board-certified neurosurgeon, founding director and CEO at Royal Spine Surgery in Phoenix.

Wally Krengel III, MD, is a board-certified orthopedic spine surgeon and chief of spine surgery at Seattle Children's Hospital.

Frank H. Valone III, MD, is an orthopedic spine surgeon at California Pacific Orthopaedics in San Francisco.

Daniel T. Laich, DO, is a board-certified neurosurgeon and neurosurgery chief at Chicago-based Swedish Covenant Health.

Alfred O. Ogden, MD, is a board-certified neurosurgeon at New York City-based Columbia University Medical Center.

Evalina Burger, MD, is a board-certified orthopedic spine surgeon at the University of Colorado Hospital in Aurora.

Federico P. Girardi, MD, is a board-certified orthopedic spine surgeon at New York City-based Hospital for Special Surgery.

Jacob M. Buchowski, MD, is a board-certified orthopedic spine surgeon at St. Louis-based BJC Healthcare.

Igor Yusupov, MD, is a neurosurgeon at Arizona Brain and Spine in Scottsdale.

Carlo Bellabarba, MD, is a board-certified orthopedic spine surgeon at the University of Washington Medicine in Seattle.

John L. Andreshak, MD, is a board-certified orthopedic spine surgeon at Soldotna, Alaska-based Kenai Spine.

Casey C. Bachison, MD, is a board-certified orthopedic spine surgeon at Intermountain Healthcare in Ogden, Utah.

Thomas J. Morrison, III, MD, is a board-certified neurosurgeon at Atlanta-based Polaris Spine & Neurosurgery Center.

George Cybulski, MD, is a board-certified neurosurgeon at Chicago-based Northwestern Medicine.

Kim D. Wright, MD, is a board-certified neurosurgeon at Anchorage, Alaska-based Laser Precision Spine Surgery.

Kraig A. Kristof, MD, is a board-certified orthopedic spine surgeon at The Toledo (Ohio) Clinic.

Jayme Hiratzka, MD, is a board-certified orthopedic spine surgeon at Portland-based Oregon Health and Sciences University.

Jonathan Citow, MD, is a board-certified neurosurgeon at The American Center for Spine & Neurosurgery in Libertyville, Ill.