Operational Intelligence for Health, Wellness, and Leadership (OIHWL) addresses human behavior and the impact of lifestyle on the Big Three health outcomes of heart attack, cancer, and suicide. It weaves together the concepts of resilience, physical wellness, nutritional wellness, mental wellness, and leadership. OIHWL’s model for behavior change is built using Aristotle’s philosophy of responsibility. OIHWL is designed to show the application of the behavioral change model throughout the book. The result is a logically consistent and easy-to-follow framework that any firefighter can apply to their life and that any fire department can adopt and implement as education for its members. This remains the case even if some, or all, of the hundreds of citations eventually age out, because the model is true. The final chapter presents an objective (and thus assessable) definition of leadership. It aims to displace the decades of leadership theory that is subjective in nature and often indistinguishable from management theory. Just as NFPA outlines categorically that certain fire apparatus are aerials and not engines, there is a way to distinguish, categorically, between leadership and management. OIHWL is the comprehensive guide for learning how to optimize behavior that is within your control.