Dr. Alan D.T. Barrett is the director of the Sealy Center for Vaccine Development and professor in the Departments of Pathology and of Microbiology and Immunology at the University of Texas Medical Branch. Stephen Morrissey, the interviewer, is the Managing Editor of the Journal. A.D.T. Barrett. Yellow Fever in Angola and Beyond — The Problem of Vaccine Supply and Demand. N Engl J Med 2016;