Mark Sayewich

Mark Sayewich's philosophy: bring clarity, and that's enough. As Director of Customer Security Evangelism at Guidewire Software, he translates security risk into business language for a living, from the developer's IDE to the executive boardroom. A 2nd-place finisher at the 2026 TMC Global Threat Modeling Hackathon, he competes at the work he preaches. His measure of success isn't the program itself; it's whether the right person changed their behavior.

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