Arnold Ringstad is a senior editor at Red Line Editorial, a book packaging company based in Burnsville, Minnesota. He graduated from the University of Minnesota. Over the course of his career he has written more than 70 books for the school library market, for readers ranging from kindergartners to high schoolers, and edited hundreds more. He has worked with many freelance writers, developmental editors, copy editors, and fact checkers. Arnold has also published research in the Journal of Cold War Studies, and he writes about the space program at apolloreview.com.