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Ryan McArthur
Principal Director - Enterprise Technology Excellence
for the Department of War, Office of the Chief Information Officer
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Ryan McArthur was appointed as a Senior Executive in June 2026, serving as Principal Director for the Enterprise Technology Excellence Office within the CIO. Ryan is an expert in defense modernization, intelligence operations, and mission-critical technical solutions, with leadership experience spanning two decades across the public and private sectors. Drawing on his deep understanding of the Department of War’s (DoW) global and enterprise mission, Ryan will lead the office responsible for delivering the enterprise services the Joint Force, Allies, and partners depend on for seamless global operations.
Under his leadership, the office will execute against three priorities: resilient Global Transport and infrastructure, mission-critical data and software delivery, and an unmatched customer experience. Together, these efforts accelerate decision velocity and sustain an overwhelming tactical advantage for commanders and warfighters across every domain.
Prior to his current appointment, he was the Special Advisor to the CIO for Capability Development and Operational Excellence and he spent time in the commercial sector as the Global Public Sector Chief Technology Officer for Defense and Intelligence at Zscaler. Leveraging this industry experience, he bridged the gap between commercial innovation and national security, translating emerging technologies into decisive operational outcomes and spearheading the adoption of next-generation security architectures across complex defense and intelligence environments.
His distinguished public service in the DoW includes leading the $9B Joint Warfighting Cloud Capability (JWCC) at DISA, serving as a strategic technical advisor to both the OCIO and the United States Marine Corps (USMC). During his tenure advising the DoW CIO, he drove enterprise-wide modernization by spearheading the deployment of Bring Your Own Approved Device (BYOAD), Defense Enterprise Office Solutions (DEOS), FLOW 3, and foundational capabilities for the Zero Trust Office. Similarly, in his advisory role to the USMC, he successfully guided the implementation of critical infrastructure and security overhauls, including the Joint Regional Security Stacks (JRSS), Office 365, MPLS network modernization, and Identity, Credential, and Access Management (ICAM). Across these roles, his execution of complex cloud and Zero Trust initiatives directly enhanced the operational readiness, security, and tactical edge of defense, intelligence, and international partners.
A decorated, retired Army Signal Chief Warrant Officer and OEF veteran, Ryan is a multi-year Federal 100 and Defense/CyberScoop50 honoree, recognized with the DoD CIO Award and DISA Exceptional Civilian Service Medal.
As of July 20, 2026