Kaitlyn Sadtler is a scientist and Chief of the Section on Immuno-Engineering at the National Institutes of Health. She began her lab at the National Institute of Biomedical Imaging and Bioengineering after a postdoctoral fellowship at the Massachusetts Institute of Technology in the Department of Chemical Engineering working on the molecular mechanisms of immune activation in the foreign body response with Dr Robert Langer (founder of Moderna). There, she was awarded a competitive NIH Postdoctoral Fellowship for her work on immunology and tissue engineering. She completed her PhD at the Johns Hopkins University School of Medicine where she showed a critical role for Th2-T cells in biomaterial-mediated muscle regeneration. Her research has been published in journals such as Science, Nature Methods, Nature Communications and Science Translational Medicine. She was recognized as a 2018 TED Fellow and delivered a TED talk that was listed as one of the top-viewed talks of 2018. Sadtler was selected for the 2019 Forbes 30 Under 30 List in Science and received the 2021 Outstanding Recent Graduate Award from Johns Hopkins University. Since starting her laboratory at the NIH, she has lent her lab's expertise to the fight against COVID-19, launching the NIH Serologic Survey, detecting 16.8 million undiagnosed SARS-CoV-2 infections in the US via remote blood sampling and antibody testing. This work continues as the team works to map the spread of the pandemic in the US from 2020 through 2021.