Sounil Yu
Chief AI Officer at RealCISO.io
Reston, Virginia, United States
Summary
👤
Senior🎓
Top SchoolSounil Yu is a cybersecurity and AI strategist who serves as Chief AI Officer at Knostic and sits on the board of The Cyber AB, bringing nine years of focused experience translating advanced research into operational security programs. He is the creator of widely adopted mental models—the DIE Triad and the Cyber Defense Matrix—and the author who codified those frameworks into a book that practitioners and executives use to align security, risk, and engineering priorities. His career blends large-enterprise innovation (as Bank of America’s Chief Security Scientist) with startup and investor roles, advising and backing companies that span application security, email protection, SaaS visibility, and asset/graph-based governance. A frequent speaker and faculty fellow, he pairs academic rigor with pragmatic tooling to secure modern developer workflows and agentic AI. Notably, he is helping define governance controls for coding agents and autonomous developer tooling at Knostic, a less obvious thread that ties his long-term frameworks to today’s AI-driven threat surface.
9 years of coding experience
28 years of employment as a software developer
B.S. Electrical Engineering Economics, B.S. Electrical Engineering Economics at Duke UniversityM.S. Electrical Engineering, M.S. Electrical Engineering at Virginia Tech
Github Skills (33)
csf10
specification9
procedures9
pci8
policies8
nist8
security7
pci-dss6
hipaa6
neo4j5
graph5
vendor5
cypher4
thermostat4
gcp4
Programming languages (5)
Github contributions (5)
cyberdefensematrix/cyberdefensematrix.github.io
Oct 2022 - Jan 2023
Contributions:5 commits, 16 pushes, 7 branches in 2 months
sounil/shark
Aug 2018 - Jan 2019
Contributions:2 pushes, 1 branch in 5 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.