Dr. Johnson is the Deputy Director of the FAA Civil Aerospace Medical Institute in Oklahoma City, Oklahoma. Prior to this position he was an Associate Professor at the University of Texas Medical Branch where he was the, Associate Director of the UTMB/NASA-Johnson Space Center Aerospace Medicine Residency Program, and the Course Director of the Introduction to Aerospace Medicine Residency short course. Dr Johnson retired from the U.S. Air Force in 2005. Bob held positions as the General Preventive Medicine Residency Director at both the US Air Force School of Aerospace Medicine and at the University of Texas Medical Branch. He is a Fellow of the American College of Preventive Medicine, a Fellow of the Aerospace Medical Association, and is the Past President of the American Society of Aerospace Medical Specialist.

Dr. Johnson has published numerous articles on flight safety and aerospace medicine. He is the co-editor of the textbook "Fundamentals of Aerospace Medicine, 4^th ed.” and he serves as an Aerospace Medicine representative on the ACGME Preventive Medicine Residency Review Committee. Throughout his career, Dr. Johnson has been closely involved with the medical aspects of population health management, clinical preventive services, safety program administration and graduate medical education.