John Vespasian is the author of nine books about rational living. He has turned his international background and his personal interest in history into a breed of personal-development books that emphasize rationality, resilience, and learning from real-life examples. His latest books are On Becoming Unbreakable, Thriving in Difficult Times, and Sequentiality: The Amazing Power of Finding the Right Sequence of Steps, which came out in 2017.