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Dean Parsons

Principal InstructorCEO and Principal Consultant at ICS Defense Force, Inc.

Specialities

Industrial Control Systems Security

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Dean Parsons

About Dean Parsons

Dean Parsons is a SANS Principal Instructor and the CEO and Principal Consultant of ICS Defense Force. He teaches ICS515: ICS Visibility, Detection, and Response and co-authors and instructs ICS418: ICS Security Essentials for Leaders. What makes Dean particularly effective in the classroom is simple: he builds OT security programs, hunts ICS-specific threats, and leads incident response operations across industrial environments, globally, then shares that real-world experience directly into class through labs and practical guidance students can apply the moment they’re back to work protecting critical infrastructure.

Over the past two decades, Dean has built and led industrial cyber defense programs, conducted incident response and digital forensics in live plants and partnered with operators and engineers to maintain both safety and uptime across major industrial sectors. He shares this fieldwork directly with ICS515 students, showing practitioners how to design visibility that respects engineering constraints, turn adversary behaviors into proactive ICS/OT-aware threat detections, and execute effective, ICS-specific responses without disrupting production. In ICS418, Dean translates these same lessons for leaders—bridging the gap between governance and the realities of the plant floor. He helps organizations align investment and policy decisions with operational priorities, developing risk metrics and tabletop exercises that unify operations, engineering, and cybersecurity so organizations in any industrial sector can prioritize and measure what matters.

Dean holds several leading industry credentials, including the Certified Information Systems Security Professional (CISSP), GIAC Global Industrial Cyber Security Professional (GICSP), GIAC Response and Industrial Defense (GRID), GIAC Security Leadership Certification (GSLC), and GIAC Certified Intrusion Analyst (GCIA). He authored the SANS ICS Cybersecurity Field Manual series and the SANS Strategy Guide: ICS Is the Business, resources designed to help organizations of all kinds build defensible ICS/OT security programs rooted in engineering principles. Dean also serves as a faculty member of the SANS Technology Institute.

Students describe Dean’s teaching as clear, energetic, and practical—rich with repeatable labs and field stories that respect both safety and uptime. He emphasizes collaboration between security professionals, operators, and engineers so teams leave class with actionable plans they can implement immediately. For motivation, he keeps it simple with a favorite reminder from Yoda: “Do. Or do not. There is no try.” When he’s not leading OT/ICS cybersecurity assessments, facilitating cybersecurity tabletop exercises, or teaching, Dean can be found adventuring on the Atlantic on his jet ski in search of icebergs, or composing music with his electronic music project, Arcade Knights.

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