Dr. Johnson is a Management Consultant and an Angel Investor. He is the Editor-in-Chief of the Medical Surveillance and Monthly Report, a peer-reviewed monthly medical journal published by the Defense Health Agency. Prior to this, he held various positions of increasing responsibility, including Corporate Medical Director, Senior Medical Director of Medical Quality, and Medical Director for Clinical Innovations for Humana Government Business in San Antonio, Texas. He has held these positions since joining Humana Government Business in September 2013.

He retains an academic position as Clinical Associate Professor of Preventive Medicine at the University of Texas Medical Branch (UTMB) School of Medicine and continues in active teaching of medical residents. Prior to joining Humana, Dr. Johnson held positions as the Deputy Director of the FAA Civil Aerospace Medical Institute in Oklahoma City, Oklahoma, and was full-time faculty at UTMB, where he served as Program Director of the General Preventive Medicine Residency, Associate Director of the UTMB/NASA-Johnson Space Center Aerospace Medicine Residency Program, and Course Director of the Introduction to Aerospace Medicine Residency short course.

Dr. Johnson retired from the U.S. Air Force in 2005 with the rank of Colonel and a Chief Flight Surgeon Aeronautical rating. While serving in the U.S. Air Force, Bob held multiple positions, including General Preventive Medicine Residency Director at the U.S. Air Force School of Aerospace Medicine, Director of the DoD Global Medicine Course, and Chief Information Officer. He was also a member of the Board of Directors for Wilford Hall USAF Medical Center, in addition to numerous international deployments.

He is a Fellow of the American College of Preventive Medicine, a Fellow of the Aerospace Medical Association, the Past President of the American Society of Aerospace Medical Specialists, and a recent Regent on the Board of the American College of Preventive Medicine. Throughout his career, Dr. Johnson has been closely involved with medical management, population health management, global health, medical quality improvement, clinical preventive services, and graduate medical education.

Dr. Johnson received a Medical Doctorate from the Uniformed Services University School of Medicine, a Master of Public Health with Distinction from Yale University School of Medicine, and a Master of Business Administration with Honors from the University of Texas at San Antonio. He is currently board-certified by The American Board of Preventive Medicine in Preventive Medicine and Public Health, as well as in Aerospace Medicine. He is also certified in Medical Quality by the American Board of Medical Quality.