Dr. Dimar received his medical degree from Wright State University School of Medicine in Dayton, Ohio. His residency training in orthopaedics was completed through the Lutheran Hospital Orthopaedic Residency Program in Fort Wayne, Indiana, followed by a six-month chief resident internship with the Leatherman Spine Center. Dr. Dimar then served in the United States Air Force at the Regional Hospital in Minot, North Dakota, serving as Chief of Surgery and Assistant Chief of Hospital Services. He then returned to Louisville to complete a spine fellowship with the Leatherman Spine Center.

Dr. Dimar is a clinical professor with the Department of Orthopaedic Surgery and Chief Pediatric Orthopaedic surgeon at Norton Children's Hospital and Director of Resident Basic Science Education at the University of Louisville School of Medicine. He is active in instructing orthopaedic surgeons and residents in the treatment of deformities, tumors, degenerative disease and trauma involving the spine. His particular area of interest is the treatment of cervical spine disease, degenerative spine disease and spine trauma.