Kellie Gerardi is an American aerospace, defense, and technology professional and a popular science communicator. She is a citizen-scientist and conducts bioastronautics research and spacesuit evaluation in microgravity with the International Institute of Astronautical Sciences (IIAS). She is a Director of The Explorers Club and serves on the Defense Council for the Truman National Security Project. She is the author of Not Necessarily Rocket Science: A Beginner's Guide To Life in the Space Age and the children's picture book series Luna Muna. Gerardi's work to promote space exploration and encourage women in STEM has attracted thousands of followers on TikTok and Instagram.