From the early days of the HIV epidemic to today's emerging and global threats, David Hamer, MD, has spent more than three decades studying infectious diseases around the world. In this episode, he discusses his path to global health, his work with major global health research and surveillance efforts, including projects on neonatal infections, emerging diseases, and pandemic preparedness and his concerns. He also shares advice for students entering the field of glob;a health and his concerns about reduced U.S. global health funding and climate change–driven outbreaks. Hamer is a professor of global health and Medicine at Boston University and an adjunct professor of nutrition at the Tufts University Friedman School of Nutrition, Science and Policy.