Leadership in the 21st century is both an art and a science, requiring a profound understanding of human behavior to navigate the complexities of an ever-changing global landscape. As organizations face challenges ranging from technological disruptions to evolving societal expectations, the ability to make informed, ethical, and impactful decisions has become a defining characteristic of successful leaders. "The Decision Leader: Harnessing Behavioral Science for Transformative Leadership" is a guide for leaders who seek to align their decision-making processes with the principles of behavioral science, enabling them to drive innovation, foster collaboration, and achieve sustainable success.