Dr. James Calvin “J. Calvin” Johnson is a board-certified orthopedic surgeon and expert witness specializing in independent medical examinations (IMEs), impairment ratings, and medico-legal case evaluations. Based in Oklahoma, he provides objective, evidence-based opinions for attorneys, insurance companies, and courts.
Our Story
Dr. Johnson is a nationally recognized orthopedic surgeon with more than 35 years of surgical experience and over 26,000 procedures performed. He specializes in independent medical examinations, medical record reviews, and expert testimony, having completed more than 2,000 IMEs and participated in numerous legal proceedings.
After a distinguished clinical career, Dr. Johnson transitioned into full-time medical-legal work. Through MedLegal Authority, he leads a growing network of subspecialty physicians and legal nurse consultants, delivering comprehensive medical insight for complex cases across multiple disciplines.
Expertise
Every physician is a board-certified specialist with years of clinical experience.
Integrity
Evaluations and testimony are impartial, evidence-based, and defensible.
Clarity
Reports and testimony that are precise, practical, and easy to understand.
Reach
In-person and secure virtual evaluations for clients nationwide.
Founder · Orthopedic Surgeon · Expert Witness
- 35+ years of orthopedic surgical experience
- Founder of OSSO (Oklahoma Sports Science and Orthopedics)
- 26,000+ orthopedic procedures performed
- 2,000+ Independent Medical Examinations completed
- Orthopedic expert witness with deposition and trial testimony experience