Prior to joining the Immunization Action Coalition (IAC), Dr. Tan was the director of medicine and public health at the American Medical Association (AMA) a position he held since 2008. From 1997 to 2008, he was the AMA’s director of infectious disease, immunology, and molecular medicine. Dr. Tan was a voting member of the Department of Health and Human Services’ National Vaccine Advisory Committee from 2009 to 2013, where he served on the adult immunization, vaccine safety, and healthcare worker immunization working groups, and chaired the immunization infrastructure working group. He also served for more than ten years as the AMA’s liaison to the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices, where he served on the influenza, pneumococcal, zoster, and adult immunization working groups. He co-founded and currently co-chairs the National Adult and Influenza Immunization Summit. He continues to advise the ESWI Flu Summit and the APACI Flu Summit. He serves or has served on the steering committees/advisory boards of the 317 Coalition, the Adult Vaccine Access Coalition (AVAC), the Unity (United for Adolescent Vaccination) Consortium, the National Network for Immunization Information, and the National Viral Hepatitis Roundtable. Dr. Tan also serves, or has served on the National Quality Forum’s Adult Immunizations Expert Committee, the Pharmacy Quality Alliance’s Adult Immunization Working Group, and numerous national and international expert and technical advisory committees, including panels for the Centers for Medicare and Medicaid Services, The Joint Commission, and the Centers for Disease Control and Prevention, on issues ranging from vaccine hesitancy, to immunization quality measurement development, to adult immunizations, to immunization access and delivery. In 2007, he founded the National Immunization Congress and organized its 2007 and 2010 meetings. Dr. Tan is an editor for Vaccine, BMC Infectious Diseases, Medscape Infectious Diseases, and a member of the ESCMID Vaccine Study Group and has published more than 50 peer-reviewed articles.