Daniel Salmon is the Director of Johns Hopkins Institute for Vaccine Safety. Before joining the Institute, Salmon was the Director of Vaccine Safety in the National Vaccine Program Office at the US Department of Health and Human Services. As director, he coordinated, evaluated and provided leadership for federal vaccine safety programs. During the 2009-10 H1N1 influenza pandemic, he oversaw the federal vaccine safety monitoring program—the most comprehensive vaccine safety monitoring effort in US history. Dr. Salmon’s primary research and practice interest is optimizing the prevention of childhood infectious diseases through the use of vaccines. He is broadly trained in vaccinology, with an emphasis in epidemiology, behavioral epidemiology, and health policy. Dr. Salmon’s focus has been on determining the individual and community risks of vaccine refusal, understanding factors that impact vaccine acceptance, evaluating and improving state laws providing exemptions to school immunization requirements, developing systems and science in vaccine safety, and effective vaccine risk communication.