In this episode, James sits down with Sounil Yu, the mind behind the Cyber Defense Matrix and DIE Triad frameworks that have transformed how organizations approach security. From his early days getting stuffed in lockers as a self-described computer geek to becoming a disruptive force at Bank of America and co-founding Gnostic, Sounil shares the mental models that have guided his three-decade journey in cybersecurity. They discuss how an accidental college worm shutdown taught valuable lessons in OpSec, and why Sounil starts with the icebreaker question: "What's the most IT damage you've caused without getting fired?"