Casey Grinnell

Cybersecurity Professional

Professional Experience

Information System Security Officer

Northrop Grumman · May 2026 – Present
  • Led vulnerability assessment operations using industry-standard scanning tools.
  • Analyzed vulnerabilities to prioritize threats and develop remediation strategies to ensure system compliance and threat mitigation.
  • Coordinated with system administrators to mitigate vulnerabilities across multiple networks and systems.
  • Maintained CTO (Certificate to Operate) status for mission-critical software.

Systems Administrator

Northrop Grumman · May 2025 – July 2026
  • Maintained mission-critical systems supporting the space force in a secure environment.
  • Coordinated incident response activities during network outages and resolved service degradation issues.
  • Developed and deployed lifecycle policies for AWS S3 buckets to automate data retention.
  • Automated secure data movement to and from AWS S3 buckets while maintaining security controls.

Cyber Defense Operations, Enterprise Operations

United States Air Force · June 2021 – May 2025
  • Provided Tier 2 and 3 support for hardware, software, and network issues across three networks for over 4,700 users.
  • Analyzed Nessus vulnerability reports and executed remediation plans for high-severity findings.
  • Developed and deployed a remote-capable PowerShell script that remediated hardware vulnerabilities across 58 systems.
  • Resolved long-standing network address allocation issues affecting 180 analysts.
  • Led testing and troubleshooting of over 2,900 systems across six specialized networks, completing a six-month estimate in 17 days.

Certifications

Education

Hands-on Lab Experience

Awards & Affiliations