TechGuard Security

TechGuard Security was formed in a basement office in 2000 as a direct response to Presidential Decision Directive 63, the Clinton-era order that first pushed the US government to treat critical infrastructure protection as a formal cybersecurity mandate. Co-founders Suzanne Magee and Andrea Johnson (a former Boeing computer engineer) built the company around DoD and Department of Homeland Security work before expanding into commercial managed security services — penetration testing, vulnerability scanning, SOC support, and its DEFEND360 threat-prevention platform — for enterprise customers.

Headquartered in the St. Louis metro area with additional Maryland and Illinois offices, TechGuard is an ISO 9001-registered, certified Small Disadvantaged Business, Disadvantaged Business Enterprise, and Woman-Owned Business Enterprise — credentials that matter directly for its core customer base of DoD, DHS, and intelligence-community contracts, where those certifications are often a prerequisite for bidding rather than a marketing point. The company has operated independently and profitably for 25 years without a public funding or acquisition event, a long run in a market segment where many peer MSSPs get acquired by larger platforms within a decade of founding.

TechGuard’s positioning is squarely as a trusted, security-cleared services and technology provider for government and government-adjacent customers rather than a venture-scale product company competing for enterprise SOC market share broadly — a narrower lane, but one with real defensibility given the compliance and clearance barriers to entry.