John Mark Larsen, M.D. is a board‑certified orthopedic surgeon with more than 30 years of experience in clinical practice and reconstructive spine surgery. He practiced for over two decades in orthopaedic surgery, specializing in reconstructive spinal procedures, fracture care, and complex trauma affecting the neuromusculoskeletal system. He completed his residency in orthopaedic surgery at LAC/USC Medical Center, followed by fellowship training in reconstructive spinal surgery at Rancho Los Amigos Medical Center. His career combines extensive surgical practice with medical‑legal expertise, making him a trusted resource for complex orthopaedic evaluations.

He provides objective, well‑supported medical‑legal opinions across a wide range of orthopaedic conditions and injury mechanisms, including motor vehicle accidents, workplace injuries, slip‑and‑fall incidents, and trauma‑related events. His services include independent medical evaluations, comprehensive record analysis, expert reports, and testimony in deposition and trial settings.

Dr. Larsen is recognized for presenting medical findings in a clear, structured manner that enables attorneys, judges, and juries to understand complex orthopaedic issues. His approach emphasizes accuracy, adherence to accepted standards of care, and careful consideration of all available medical evidence.

Dr. John M. Larsen is licensed to practice medicine in: California.