Greg Sisson is an executive-level cybersecurity leader with extensive experience in developing and implementing cybersecurity programs that address the unique challenges faced by critical infrastructure owners and operators. As a co-founder and Chief Operating Officer of CI-Discern, Greg leads efforts to enhance governance, oversight, and strategic capabilities for critical infrastructure owners and operators, helping them align cybersecurity programs with regulatory requirements, and ensuring a risk-based approach.

Prior to co-founding CI-Discern, Greg served as the Chief Information Security Officer (CISO) at the U.S. Department of Energy (DOE), where he oversaw department-wide cybersecurity operations, risk management, and compliance. He also held the position of Managing Director in EY’s Energy Cybersecurity Consulting practice, where he worked with CISOs across power and utilities, oil and natural gas, and global manufacturing sectors to transform their cybersecurity programs.

Greg’s public service career includes leadership roles at Joint Force Headquarters Department of Defense Information Network (JFHQ-DODIN), where he directed global defensive cyberspace operations, and at the Joint Staff, where he contributed to the development of the DOD’s Cyber Strategy. A proud military veteran, Greg retired as a Signal Officer after serving over 20 years in the U.S. Army.

Greg holds a Bachelor of Arts in History from the University of South Carolina Aiken and a Master of Arts in National Security and Strategic Studies from the College of Naval Warfare in Newport, RI. He is a respected advisor to CISOs, CIOs, and CTOs, bringing deep expertise in aligning cybersecurity programs with frameworks like NIST and CISA guidelines to foster resilience and operational efficiency.