Sounil Yu at the MITRE ATT&CK Conference, holding up a life-size poster of the MITRE ATT&CK framework. Yu has contributed to cybersecurity models in his own right, having developed the Cyber Defense Matrix that was described by one tech leader as the “must-have playbook in modern information security programs.” Keeping tabs on the vast constellation of vendors in the cybersecurity space, what they do and how they fit into your overall defense strategy can sometimes feel like trying to count the stars in the sky. Understanding this landscape has never been more critical for businesses today, which is why Sounil Yuâs Cyber Defense Matrix is so valuable.