Mr. Mark Sayewich CISSP

Mark Sayewich's philosophy is simple: bring clarity, and that's enough. As Director of Customer Security Evangelism at Guidewire Software, he's made a career out of demystifying security risk and translating it into language that moves decisions, from the developer's IDE to the executive boardroom. A 2nd-place finisher at the 2026 TMC Global Threat Modeling Hackathon, Mark doesn't just advocate for proactive security, he competes at it. He's currently documenting the methodology behind that win so others can build on it. His mission: make security a fundamental part of organizational culture, not an afterthought. And his measure of success isn't the threat model itself. It's whether the right person said yes.