Trusted Security Services for Maryland, D.C., and Pennsylvania
Family-owned and led by a seasoned law enforcement professional, Defender One delivers reliable, responsive security—available 24/7 and tailored to your needs.
We Care About Your Safety
Defender One Security delivers trusted, comprehensive security solutions across Maryland, Washington, D.C., and Pennsylvania. Founded in 2009 by Baltimore native Jon Krieger, the company remains proudly family-owned and operated.
With more than 30 years in law enforcement—including leadership roles in patrol, internal affairs, traffic, and community outreach—Jon launched Defender One to bridge the gap between private security and public safety. That same commitment to professionalism, accountability, and community still drives the company today.
As a family-run business, Defender One offers a level of personal service and responsiveness national firms often can’t match. Jon and his wife Jennifer oversee daily operations, working directly with clients to ensure every detail is handled with care and integrity.
Trusted Security Solutions Since 2009
Decades of experience, grounded in law enforcement leadership and a commitment to professionalism you can count on.
Highly Trained Security Professionals
Our team is made up of skilled, vetted experts trained to deliver preventative, site-specific protection.
24/7 Coverage and Peace of Mind
We provide around-the-clock security through contracted services—ensuring consistent presence, not reactive response.
Family-Owned, Personally Committed
We’re not a faceless franchise. Every client matters, and every detail is handled with care by our leadership team.
Don’t leave safety to chance. Work with a team that treats it like a priority—because it is.
Our Comprehensive Security Services
Reliable Security Presence for Your Property
Uniformed security professionals stationed at your facility to deter threats, safeguard property, and ensure a safe environment. Ideal for corporate offices, retail, schools, healthcare facilities, and more.
Executive and Personal Security You Can Trust
Whether you need discreet protection for an event or long-term security for high-profile individuals, our team delivers peace of mind with professionalism and discretion. Transportation services available.
Fast, Professional Fingerprinting for Individuals & Teams
We offer efficient fingerprinting for employment, licensing, compliance, and more. Available for individuals or coordinated group sessions for companies and organizations.
News & Resources
From Access Control to AI: Transforming Security with Technology
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Making Maryland Family Events Safe and Memorable
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Protecting Executives Amid Rising Security Threats
High-profile executives encounter a variety of security threats that require proactive and customized protection. From physical risks to cyberattacks, these challenges jeopardize their safety and the stability of their organizations. Effective strategies for...
Building a Safer Corporate Culture Using Top Security Experts
Creating a workplace that prioritizes safety is no longer an optional endeavor—it’s a critical component of any successful business strategy. Building a safer corporate culture using top security experts helps companies create customized solutions for workplace...
Maryland Businesses Role in Supporting Local First Responders
Maryland businesses strengthen community safety by playing a crucial role in supporting local first responders through partnerships. From equipping firefighters with advanced tools to providing resources for emergency medical teams, the collaborative efforts of local...
Creating Safer Communities with Professional Security Solutions
Creating safer communities with professional security solutions involves tailored strategies to address modern safety challenges effectively. Safety remains a foundation for thriving neighborhoods and productive environments. Whether managing residential areas or...