Welcome to Defender One Security

We Care About
Your Safety.

WHO WE ARE

Defender One Security is a distinguished provider of comprehensive security solutions serving the Maryland region. Founded in 2009 by Jon Krieger, a Baltimore native, Defender One remains a family-owned and operated business. Jon’s vision was to bridge the gap between traditional security services and law enforcement, drawing on his distinguished 30-year career in supervisory roles across patrol, internal affairs, traffic, and community outreach. Today, the daily operations are managed by Jon, and his wife, Jennifer, ensuring the continued commitment to excellence in security services.

Effective Highly Trained Security Personnel

Our highly trained security guards, both armed and unarmed, are equipped to handle diverse security situations. Their expertise covers conflict resolution, emergency response, and providing exceptional customer service, ensuring comprehensive protection in any environment.

Risk Assessment & Customized Security Plans

We conduct detailed risk assessments to identify vulnerabilities and implement customized security plans to mitigate threats. Our proactive approach ensures comprehensive protection, preventing unforeseen issues and safeguarding your assets and safety.

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OUR SERVICES

ON-SITE SECURITY

We protect your members, your clients, your patients, your employees, your loved ones. In this unpredictable world, Defender One protects you from potential threats and unexpected incidents. Together, our people and technology provide the security and protection you need.

SPECIALIZED
SECURITY SERVICES

Specialized security services encompass a range of focused and tailored security solutions designed to meet specific needs and challenges. These services go beyond general security measures and address unique risks and requirements. The scope of specialized security services can vary depending on the context, industry, and client needs.

PRIVATE INVESTIGATIONS

We uncover hidden truths. Our private investigation and detective services can provide you with the information you are seeking. From background checks to locating missing persons, corporate investigations, insurance fraud inquiries, asset searches, domestic violence cases, domestic situations, and much more.

EXECUTIVE PROTECTION

Executive protection is a job that requires both tactical and social skills. Defender One understands crowd dynamics and knows how to mitigate any chance of threats. With extensive training in conflict resolution, our team is well-equipped to handle diverse situations and ensure the safety of our clients.

CLIENT CONSULTING

Drawing upon decades of expertise in security, our team is well-equipped to evaluate your existing security framework, pinpoint potential vulnerabilities, and take proactive measures to minimize security risks.

WHAT IS THE COST OF PROTECTING YOUR ASSETS?
CLIENT REVIEWS

It was a pleasure using Defender One for our security needs. They were very professional and punctual. I highly recommend Defender One for ALL your security needs.

Marshall Rief

Defender One is an incredible company to work with. Their security team is professional and pleasant to work with. I have seen members of their team deal with a variety of emergencies and all were handled efficiently and had great outcomes. I feel completely safe working with Defender One and I am so thankful they are here to protect us.

Carly Schwartz Chizuk Amuno Congregation & Schools

Provides excellent, expert services for our organization.

Sandy Nissel CEO // The Bais Yaakov School

I have been employed by Defender One for a year! Without a doubt it’s the best career move of my life! I have read some of the reviews and realize that if you do your job, show up on time and work hard, your experience will be a great one! Hard work pays off with Defender One! Very professionally trained and well treated! Good luck in your search and consider DF1 in your future!

Bill Painter Employee // Defender One

We love Defender One! They always do an excellent and professional job for our organization! Thank you once again for keeping our community and members safe.

Caren Levin Executive Director // BZD

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.

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.

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.

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.

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.