William O’Connell leads cybersecurity engineering, secure infrastructure modernization, and governance, risk, and compliance (GRC) initiatives supporting ATOLLO customers operating in defense and regulated environments.
With extensive experience spanning enterprise IT operations, cybersecurity architecture, Microsoft 365 GCC High and Azure Government environments, and operational technology modernization, William is recognized for helping organizations strengthen security posture while enabling practical, mission-focused technology transformation.
His expertise includes RMF-aligned security engineering, NIST SP 800-53 and NIST SP 800-171 implementation, CMMC readiness, vulnerability management, secure systems architecture, and enterprise infrastructure modernization across complex operational environments.
Throughout his career, William has combined deep hands-on technical expertise with executive-level leadership supporting cybersecurity operations, infrastructure resilience, and secure modernization initiatives aligned with evolving defense and government requirements.