Sounil Yu is a distinguished cybersecurity expert, author, and speaker, who currently serves as the Co-Founder and CTO of Knostic, a company that provides need-to-know access controls for Generative AI, ensuring personalized and secure responses from Large Language Models (LLMs) by tailoring answers to each employee’s context.

With over a decade of experience in cybersecurity, Sounil is the creator of the D.I.E. Triad and the Cyber Defense Matrix—two groundbreaking frameworks that have reshaped how organizations approach security.

Sounil regularly shares his insights at conferences and through various publications, often focusing on the integration of artificial intelligence, machine learning, and automation in security. Sounil is also a Fellow at GMU NSI’s Cyber and Tech Center and has a long-standing commitment to advancing cybersecurity knowledge and practices.

In addition to his role at Knostic, Sounil recently authored his first book, the Cyber Defense Matrix: The Essential Guide to Navigating the Cybersecurity Landscape, a comprehensive guide to understanding and managing security capabilities. Sounil holds a B.S. in Electrical Engineering and Economics from Duke University and an M.S. in Electrical Engineering from Virginia Tech.

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