Bruce G. Gellin, MD, MPH, senior vice president and chief of global public health strategy at The Rockefeller Foundation, was a source of science-based information about vaccines long before misinformation and disinformation became buzzwords. From developing the first pandemic influenza preparedness and response plan for the US in 2005, to decades spent working to promote public health, he has been a pivotal voice in shaping public health policy in the US and globally.