In the latest installment of our Privacy Protectors Spotlight series, we are excited to feature ethical hacker and educator Bailey Marshall.
Bailey Marshall is a hacker, cybersecurity educator and consultant whose technical expertise spans penetration testing, red-team engagements, dark web investigations, open-source intelligence (OSINT), and proactive security strategy. She is the Founder and Principal Consultant of The Security Rex, a platform where she produces approachable, high-impact cybersecurity content and provides consulting services to businesses. In 2024, she co-founded Future Proof Security, an initiative dedicated to equipping parents, educators, and communities with tools to protect youth from online threats.
Background
A U.S. Army veteran with over six years of active-duty service, Bailey’s introduction to the field came unexpectedly—through an Army assignment in IT and cybersecurity. Though she originally studied psychology and planned to pursue medicine, she found herself drawn to the problem-solving and human-centered challenges of security. After earning her Security+ certification and later a Master’s degree in cybersecurity, she fully embraced the field, bringing a psychological lens to cyber threat intelligence and offensive security operations.
Since leaving the military, Bailey has charted an impressive path across both public and private sectors. She served as a Senior Consultant at Mandiant, where she contributed to purple teaming, OSINT, and incident response engagements. She currently supports Google’s public sector clients as a Security Customer Engineer and serves as Director of Innovation and Program Management at Applied Technology Academy, where she previously led curriculum development and red team training as a Senior Instructor. She also shares her expertise as adjunct cybersecurity faculty at Southern New Hampshire University.
Bailey’s work is grounded in the belief that cybersecurity education should be accessible to everyone. Her hands-on experience in both offensive security and threat intelligence informs her advocacy for stronger privacy and proactive security practices. Whether she’s mentoring up-and-coming professionals, helping businesses enhance their security posture, creating free educational content, or helping families understand digital safety, Bailey is driven by a mission to serve, educate, and equip others with the means to protect themselves.
The Security Rex
Bailey Marshall’s commitment to making cybersecurity accessible is exemplified through her educational platform, The Security Rex. With a focus on clear, approachable content, The Security Rex breaks down topics like social engineering, penetration testing, and open-source intelligence (OSINT) into tutorials, cheat sheets, and bite-sized videos designed for learners of all backgrounds.
Much of the knowledge provided by The Security Rex has traditionally been gatekept—locked behind paywalls, certifications, or insider-only communities.
Bailey actively works to remove those barriers. Through sharing toolkits for newcomers or hands-on challenges for professionals—like her March 2025 exercise on writing better pentest reports—her goal is to empower others with the skills and understanding they need to thrive in cybersecurity.
“Why do I do free and low-cost training when others are selling theirs based on empty promises and often for a fortune?” she asked in a recent post.