Wilbur H. Chen, MD, MS, is the Frank M. Calia, MD Endowed Professor of Medicine, chief of the division of geographic medicine, and director of travel medicine practice at the University of Maryland School of Medicine. He is also chief of the adult clinical studies section at the University of Maryland Center for Vaccine Development and Global Health. A physician-scientist who trained in adult infectious diseases, his career has covered the development and use of vaccines to address global health problems. He was a voting member of the Centers for Disease Control and Prevention (CDC) Advisory Committee on Immunization Practices (ACIP) from 2020-2024. His academic research has focused on vaccines against diarrheal diseases, including cholera, Campylobacter, Shigella, Cryptosporidium, salmonella, and Clostridioides difficile (C. diff). He also has extensive clinical research experience on vaccines against influenza, meningococcal disease, and biodefense agents, including anthrax, smallpox, tularemia, and staphylococcal enterotoxin. Chen has served on the planning committee of the NFID Clinical Vaccinology Course since 2019 and as an NFID speaker on travel vaccines.