Dr. Johnson is currently the Global Medical Director, Medicine and Occupational Health Department for Exxon Mobil Corporation.  The department delivers services to over 80,000 ExxonMobil and affiliate employees worldwide.  In addition to traditional work-related health services, this department delivers travel medicine to the many ExxonMobil employees who are engaged in exploration and production in a number of challenging environments worldwide.  The department includes industrial hygiene, drug testing and health promotion services.
 
Dr. Johnson is board certified in internal medicine, cardiology and occupational medicine.  He did his undergraduate work at Sarah Lawrence College where he was student body president.  He studied medicine at Yale University School of Medicine.  In addition to a cardiology fellowship, Dr. Johnson did a military/basic science fellowship at Walter Reed Army Institute of Research followed by two years as a postdoctoral student in the field of microwave research.  He has published a variety of articles in various fields.
 
Dr. Johnson is a Board Member to the Milbank Memorial Fund and National Business Group on Health.  He serves as an advisor and lecturer for the “Global Medical Clinic Course” sponsored by Harvard Medical School. He also is on the IOM NIOSH HSE Review Committee.  He is a member of the Urban League's advisory board BEEP (Black Executive Exchange Program) and the Joint Commission Advisory Board Globalization of Health Services.  He is the past Chairman of the Virginia Health Care Foundation.