Dr. Sullivan is a tenured Senior Investigator and Chief of the Biodefense Research Section at the Vaccine Research Center, a division of the National Institute of Allergy and Infectious Diseases (NIAID) at the NIH. She conducted her doctoral thesis in the laboratory of Dr. Joe Sodroski, where her work demonstrated that primary HIV isolates exhibit resistance to antibody neutralization due to occlusion of the coreceptor binding site on gp120. Following her work on HIV, Dr. Sullivan pursued postdoctoral training under the guidance of Dr. Gary Nabel, studying the mechanisms of Ebola virus pathogenesis and immune protection.