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Ryan PendergastRP
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Ryan Pendergast

@ryanpendergast

I investigate identity compromise, build detections, and automate enterprise security response across cloud and endpoint environments.

United States
Message

At ReliaQuest, I investigate and contain identity, endpoint, and cloud security incidents across 1,000+ enterprise environments. I ranked first among approximately 170 specialists company-wide for throughput and investigation quality.

I've contained a confirmed DPRK IT-worker intrusion within six minutes, authored and deployed detections for device-code phishing and mass Intune device wipes, and identified missing Microsoft 365 and Defender XDR telemetry during an active account-takeover investigation. I also build Python automations and security connectors that support credential rotation, certificate renewal, and approved response actions.

Previously, I mitigated 400+ phishing attempts at Evans and Dixon, supported DLP and ISO/IEC 27001 efforts, and developed Zero Trust microsegmentation and privileged-access controls at Hussmann. I also evaluate frontier LLM security against prompt injection, jailbreaks, and dual-use security requests through Handshake AI.

Experience

Work history, roles, and key accomplishments

ReliaQuest logoRE
Current

Security Specialist

May 2025 - Present (1 year 4 months)

Investigated and contained identity compromises across Microsoft Entra ID, Microsoft 365, and Defender XDR, authored detection logic for identity and device attacks, and automated security workflows in Python against vendor APIs. Ranked first of approximately 170 specialists company-wide on throughput and investigation quality.

Education

Degrees, certifications, and relevant coursework

University of Nevada, Las Vegas logoUV

University of Nevada, Las Vegas

Master of Science, Cybersecurity

2026 -

Pursuing a Master of Science in Cybersecurity, with studies ongoing.

University of Missouri, St. Louis logoUL

University of Missouri, St. Louis

Bachelor of Science, Cybersecurity

Earned a Bachelor of Science in Cybersecurity with an emphasis in Information Systems.

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