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service You Can Trust

We Provide 24/7 On-Site Security

Protect your property, people, and peace of mind—with licensed, professional security solutions tailored to your needs.

Armed & Unarmed
Security Guards

Our professionally trained guards—armed or unarmed—deliver visible, reliable protection tailored to your site’s needs.

24/7 On-Site Patrol & Monitoring

We provide around-the-clock patrols and surveillance to deter threats, and maintain a secure environment.

Commercial, Residential, and Event Security

From office buildings and apartment complexes to hospitals and schools, we deliver flexible security solutions.

Your Security. Our Priority.

Trusted Security Professionals, On-Site When You Need Them.

Whether you need 24-hour security guards, on-site protection, or special event security, we deliver professional, responsive, and reliable on-site coverage—day and night. We serve a wide range of clients, including:

  • Commercial Buildings & Job Sites
  • Hospitals & Healthcare Facilities
  • Education K-12 & Universities
  • Apartments & HOAs
  • Retail & Loss Prevention
  • Cannabinoid Dispensaries
  • Private Parties & Corporate Functions

Transparent Pricing. Tailored Solutions.

Why Choose Us?

As a family-owned business, your safety is personal to us. We take a holistic, hands-on approach to your security needs—because we’re not just operating in the community, we’re part of it. Our priority is building lasting relationships and protecting what matters most to our partners.

Fully Licensed & Insured

We operate with full licensing and insurance for your protection and peace of mind—no shortcuts, no risks.

Trained Vetted Security Professionals

Our guards undergo rigorous background checks and industry-specific training to ensure you’re working with the best.

Real-Time Communication & Monitoring

Stay informed with real-time updates, reporting, and access to our responsive support team whenever you need it.

Get in Touch

Need a quote? We offer competitive rates with customized packages based on your security needs—whether it’s short-term coverage or long-term protection.

Get a free consultation today. No obligation, just expert advice.

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Defender One Security is a distinguished provider of comprehensive security solutions throughout the Maryland region.
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Office Hours: Monday – Friday from 8:30 AM to 5:00 PM
Copyright © 2023 Defender One. All rights reserved.
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Defender One is a distinguished provider of comprehensive security solutions throughout the State of Maryland.

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Copyright © 2025 Defender One. All rights reserved. Site design by Silesky Marketing.

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Chad Emrick

Scheduling Administrator

As Scheduling Administrator, Chad leverages twenty years of administrative and management experience to enhance Defender One’s operational excellence. For Chad, the scheduling process is like putting together a puzzle—finding just the right pieces to fill every slot. His strategic mindset and knack for process optimization have consistently elevated his organizational efficiency. The security industry is 24/7. Thus, Chad’s methodical preparation and adaptable management style keeps our operations running smoothly.

When not orchestrating schedules at Defender One, Chad dedicates himself to his treasured role— a devoted family man. He and his wife Wanda have raised four remarkable children. Most recently, adding a new dimension to his life’s joy is his grandson, Leo.

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Phil Kline

Regional Manager – Baltimore Metro Region

Phil’s career began in the U.S. Air Force, where he served as a Military Police Officer. His training as an Internal Response Unit member equipped him with essential skills in safety, security, and crisis management. One of his most fulfilling experiences was responding to Hurricane Sandy, where he played a vital role in assisting those affected by the disaster.

Following his military service, Phil transitioned to the building supply industry, where he spent a decade as an Operations and Sales Manager. During this time, he honed his leadership, process improvement, and industry analysis skills. His passion for identifying opportunities and driving positive change has been a constant throughout his career.

With a strong foundation in problem-solving and a resilient mindset, Phil is dedicated to applying his expertise to create impactful solutions. Whether leading teams, optimizing processes, or tackling complex challenges, he approaches every task with integrity and a focus on results.

Outside of work, Phil is an avid motorcyclist and enjoys spending time outdoors, hiking, and camping. One of his most memorable adventures was conquering the challenging hike to the top of Angels Landing in Zion National Park, Utah.

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Cynthia Cox

Human Resources Manager

With 21 years of management experience across various industries, including staffing, transportation, small business ownership, accounting, and operations, Cynthia brings a wealth of knowledge and a robust skill set to Defender One. Her diversified background has equipped her with a keen understanding of multiple business domains, making her an invaluable asset to the team.

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Jennifer Krieger

Chief Administrative Officer

Jen currently serves as Defender One’s Chief Administrative Officer, managing the HR and back-end finance teams.
 

Jen has 30 years of experience in healthcare benefits administration, retirement benefits, financial planning and human resources. Jen holds a Bachelor’s Degree in Accounting from the University of Maryland, College Park and a Master’s Degree in Finance from Loyola University. Jen prioritizes an employee focused and driven company, with an emphasis on client and employee satisfaction. Outside of work, Jen enjoys running, watching her daughter play Division 1 Lacrosse, and playing with her grand-dogs.

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Jon Krieger

Owner

Jon is the President and Founder of Defender One. Jon started Defender One in 2009, with the goal of bridging the gap between conventional security guards and law enforcement. Jon had a long and distinguished career in a large metropolitan police department for over 30 years, holding supervisory positions in several units, including patrol, internal affairs, traffic and community outreach. Jon has a Bachelor’s Degree in Criminal Justice from the University of Maryland, College Park. Outside of work, Jon spends his time spoiling his dog Abe and grand-dogs Fred and Barney, supporting the Ravens and Orioles, and watching his daughter play Division 1 Lacrosse.

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