Skip to main content

    Sounil Yu

    Sounil Yu is a researcher increasingly influential at the intersection of cybersecurity architecture and AI risk.

    #47 Vulnerability Management
    15CiteRank

    Last updated 11 Nov 2026 · Named in 9 answers across 2 engines
    Bing AI Mode starts a separate baseline. Copilot remains a separate public engine and keeps its history; changes across the switch are not like-for-like growth.

    How AI engines see them

    Recognized by 3 of 3 measured engines. Updated 2026-11-06

    The recognizing engines agree that Sounil Yu is a cybersecurity strategist linked to Knostic and known for creating the Cyber Defense Matrix. They also connect him to the AI Defense Matrix, which maps AI security concerns and red teaming findings to defensive functions. Gemini adds that he is Founder and CTO of Knostic and co-authored the AI Defense Matrix with Lenny Zeltser. Chat_gpt adds former roles at Bank of America and JupiterOne, plus the DIE Triad and a SANS Lifetime Achievement Award. Google_ai_mode adds that he is Chief AI Officer at Knostic and writes about the AI security vendor landscape. The engines cite aidefensematrix.com most often.

    • ChatGPTNot named

      Sounil Yu is a cybersecurity strategist and entrepreneur with over 30 years of experience, co-founder and Chief AI Officer of Knostic, and creator of the Cyber Defense Matrix.

      Known for
      • Creator of the Cyber Defense Matrix
      • Creator of the DIE Triad
      • SANS Lifetime Achievement Award recipient
    • GeminiNot named

      Sounil Yu is a cybersecurity authority, author, and innovator best known for creating the Cyber Defense Matrix and the D.I.E. Triad.

      Known for
      • Creating the Cyber Defense Matrix
      • Creating the D.I.E. Triad
      • Co-authoring the AI Defense Matrix
    • Google AI ModeNot named

      Sounil Yu is Chief AI Officer at Knostic and creator of the Cyber Defense Matrix, focused on structuring AI risk and defenses.

      Known for
      • Creating the Cyber Defense Matrix
      • Co-creating the AI Defense Matrix
      • Organizing AI security tools
    • PerplexityNot named

      No description yet.

    • Bing AI ModeNot named

      No description yet.

    • CopilotNot named

      No description yet.

    Top Segments

    • #47Vulnerability Managementof 61
      Named in 2 answers

    Track Sounil

    Follow Sounil's measured AI visibility and see the questions where they rank.