Luke Sheppard is a Senior Security Consultant at Bishop Fox, specializing in web application security, API penetration testing, and AI/LLM-integrated application assessments. With extensive experience in infrastructure security, he has secured environments spanning CI/CD pipelines and AWS cloud ecosystems.

As an active security researcher and developer, Luke leads the Bishop Fox LLM Penetration Testing Service-level Advisory Board (SLAB), where he guides the strategic direction of AI/LLM testing practices. He authored the AI/LLM Penetration Testing Playbook, evaluated numerous open-source LLM security tools, and frequently mentors other consultants on advanced AI/LLM testing tools, techniques, and theory. Luke also develops automation tooling in Python and Golang to enhance and customize penetration testing workflows.

Beyond client engagements, Luke contributes to the broader security community as a volunteer developer for open-source security initiatives and is the creator of Instability.py, a specialized tool for security automation. He also mentors aspiring security professionals through programs such as Bishop Fox Mentorship, RaiseMe, HackTheBox, and TryHackMe.

Luke is a co-owner of a patent for a novel cybersecurity approach titled “Value-adaptive security threat modeling and vulnerability ranking.”

His credentials include Graduate Certificate in Penetration Testing & Ethical Hacking (SANS Technology Institute), GIAC Penetration Tester (GPEN), GIAC Web Application Penetration Tester (GWAPT),

GIAC Certified Incident Handler (GCIH), GIAC Cloud Security Automation (GCSA), and Certified Information Systems Security Professional (CISSP).