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In 2020, Security Magazine listed Sounil Yu as one of the most Influential People in Security in 2020, in part because of his work on the Cyber Defense Matrix, a framework for understanding and navigating your cybersecurity environments. The Cyber Defense Matrix started as a project when Sounil was the Chief Security Scientist at Bank of America. The initial problem he focused on with the matrix was how to evaluate and categorize vendors and the solutions they provided. The Cyber Defense Matrix is a structured framework that allows a company to understand who their vendors are, what they do, how they work along side one another, what problem they profess to solve, and ultimately to find gaps in the company’s portfolio of capabilities. In the seven years Sounil has been working on the project, he has developed use cases that make the Cyber Defense Matrix practical for purposes such as rationalizing technology purchases, defining metrics and measurements, and identifying control gaps and opportunities. The m