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David Cook

@davidcook

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Senior cybersecurity leader specializing in DoD/federal RMF, ATOs, endpoint and cloud security.

United States

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What I'm looking for

I seek a senior cybersecurity leadership role in a mission-focused federal/DoD environment to drive RMF/A&A, lead endpoint and cloud security programs, mentor teams, and deliver accreditation-ready, compliance-driven outcomes.

I am a senior cybersecurity and IT operations leader with more than 10 years securing mission-critical DoD and federal systems. I focus on aligning technical controls with NIST, DISA and HIPAA requirements to protect high-value assets.

I designed and implemented Trellix endpoint security across 2,000+ endpoints, configured split-server ePO architectures, and led RMF/A&A efforts that supported successful ATO renewals. I drove vulnerability management improvements by transitioning legacy ACAS to Tenable.sc and integrating continuous monitoring with Qmulos and Splunk.

I have led 24/7 global operations, directed teams of network and systems engineers, and maintained near-perfect availability and SLA compliance while resolving priority incidents and chairing change review boards. My process improvements reduced critical vulnerabilities and cut reporting time through automated dashboards and standardized SOPs.

I bring pragmatic leadership, measurable security outcomes, and a mission-first mentality to every engagement. I enjoy mentoring teams, improving operational resilience, and delivering accreditation-ready systems that meet strict federal and DoD standards.

Experience

Work history, roles, and key accomplishments

Information System Security Officer

Lockheed Martin

Dec 2021 - Mar 2025 (3 years 3 months)

Implemented Trellix ESS across 2,000+ endpoints in five isolated enclaves, achieving 95%+ compliance and contributing to a successful 3-year ATO renewal in 2024. Led RMF continuous monitoring with Qmulos and Splunk to support forensic analysis and audit readiness.

Splunk Qmulos Tenable DISA STIGs)Endpoint Security Vulnerability Management

Senior Watch Officer

Aerodyne Industries

Feb 2019 - Nov 2021 (2 years 9 months)

Commanded 24/7 operations for MDA's global network, ensuring 99.99% availability across 15+ sites and directing a team of 18 engineers. Resolved 150+ Priority 1/2 incidents, implemented ACAS/HBSS enforcement and reduced critical vulnerabilities by 35%.

Network Operations Incident Response AWS GovCloud ACAS DISA STIGs)

Network & Server Administrator

Creek Technologies

Sep 2016 - Jan 2019 (2 years 4 months)

Engineered and deployed a $300K Dell EMC Hyper-V cluster virtualizing 15 legacy systems to achieve high availability and hybrid-cloud redundancy; upgraded core switches to improve throughput by 40%. Secured AWS S3 environments storing PHI for 50K+ patients and enforced DISA STIGs across network assets.

Hyper V Dell EMC Cisco 9300 9500 OSPF Microsoft SQL AWS S3 DISA STIGs)Virtualization

Health-IT Operations Manager

U.S. Air Force

Oct 2013 - Aug 2016 (2 years 10 months)

Led a 15-person IT team supporting hospital infrastructure across five facilities, achieving 99.9% uptime and reducing critical tickets by 35%. Directed 10GbE uplink upgrades and CCRI preparation, resulting in a Top 10% DISA inspection ranking.

ITSM 10GbE Change Management AFMAN 33 152 HIPAA 10 GbE