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Protos is here to help reduce the burdens of managing your security program. Please leave us a message and one of our service specialists will be in touch with you soon.

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Protos Security main office

Protos Headquarters

383 Main Ave, Suite 505
Norwalk, CT 06851, USA

Phone: 203.941.4700


Dispatch & Support Centers

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Dallas, TX

Off-Duty Services

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Houston, TX

Off-Duty Services

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Los Angeles, CA

Specialized Services

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Atlanta, GA

Remote Services

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Washington, DC

Specialized Services

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Roanoke, VA

Guarding Services

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Norwalk, CT

Corporate Headquarters

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Chicago, IL

Specialized Services

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Nashville, TN

Specialized Services

Dispatch & Support Centers

Off-Duty

Services

Protos OFF-Duty Services

580 Westlake Park Blvd
Suite 400
Houston, TX 77079

PHONE:  281.346.2188

Summit Off-Duty Services

5100 N. O’Connor Blvd.
Suite 100
Irving, TX 75039

PHONE:  866.960.0159

Guarding

Services

Protos Security

110 Franklin Road SE
8th Floor
Roanoke, VA 24011

PHONE:  866.403.9630
VA LICENSE:  (DCJS ID: 11-5615)

Remote

Services

Protos Security

One Meca Way
Norcross, GA 30093

PHONE:  866.403.9630

Specialized

Services

Blue Star Specialized Services

6400 Shafer Ct.
Suite 200
Rosemont, IL 60018

PHONE: 708.669.7470

Associated Protective Service

916 5th Avenue South
Nashville, TN 37203

PHONE:  866.403.9630

Squad Security

2015 Manhattan Beach Blvd.
Suite 106
Redondo Beach, CA 90278

PHONE:  424.541.7018

Field Support Centers

Protos Security

500 Ala Moana Blvd,
Suite 7400
Honolulu, HI 96813

PHONE:  866.403.9630

Protos Security

301 Grant Street
Suite 270
Pittsburgh, PA 15219

PHONE:  866.403.9630

Protos Security

75 State Street
Suite 100
Boston, MA 02109

PHONE:  866.403.9630

Protos Security

801 Brickell Avenue
8th Floor
Miami, FL 33131

PHONE:  866.403.9630

Protos Off-Duty Services

4301 South Pine Street
Suite 14
Tacoma, WA 98409

PHONE:  281.346.2188

Protos Off-Duty Services

5440 SW Westgate Drive
Suite 340
Portland, OR 97221

PHONE:  708.669.7470

SQUAD Security

50 Charles Lindbergh Blvd.
Suite 608
Uniondale, NY 11553

PHONE:  212.485.8520

Off Duty OFFicers

2365 La Mirada Drive
Vista, CA 92081

PHONE:  844.249.7180

Associated Protective Service

700 12th Street NW
Suite 700
Washington, DC 20005

PHONE:  202.558.5154

Protos Security

500 Ala Moana Blvd,
Suite 7400
Honolulu, HI 96813

PHONE:  866.403.9630

Protos Security

301 Grant Street
Suite 270
Pittsburgh, PA 15219

PHONE:  866.403.9630

Protos Security

75 State Street
Suite 100
Boston, MA 02109

PHONE:  866.403.9630

Protos Security

801 Brickell Avenue
8th Floor
Miami, FL 33131

PHONE:  866.403.9630

Protos Off-Duty Services

4301 South Pine Street
Suite 14
Tacoma, WA 98409

PHONE:  281.346.2188

Protos Off-Duty Services

5440 SW Westgate Drive
Suite 340
Portland, OR 97221

PHONE:  708.669.7470

SQUAD Security

50 Charles Lindbergh Blvd.
Suite 608
Uniondale, NY 11553

PHONE:  212.485.8520

Off Duty OFFicers

2365 La Mirada Drive
Vista, CA 92081

PHONE:  844.249.7180

Associated Protective Service

700 12th Street NW
Suite 700
Washington, DC 20005

PHONE:  202.558.5154

Latest News &
Blog Updates

Workplace violence affects every industry, posing risks to employee safety, business continuity and legal compliance. At Protos, we believe that prevention starts with preparation. In this article, we explore actionable workplace violence prevention strategies, training approaches and risk management frameworks to help organizations create safer, more resilient environments.
Protos Security spotlights the growing success of Protos Select, a mobile platform purpose-built for off-duty law enforcement seeking flexible, high-quality job opportunities. Since its rollout, Protos Select has become a trusted solution for both off-duty law enforcement and agencies, simplifying off-duty shift management and creating new standards for transparency, speed and reliability.
The topic of executive protection has been making headlines recently, as growing concerns around personal safety, corporate risk and public visibility continue to rise. This article breaks down the critical differences between travel and residential executive protection, exploring which services best align with high-profile individuals and their families.
Workplace violence affects every industry, posing risks to employee safety, business continuity and legal compliance. At Protos, we believe that prevention starts with preparation. In this article, we explore actionable workplace violence prevention strategies, training approaches and risk management frameworks to help organizations create safer, more resilient environments.
Protos Security spotlights the growing success of Protos Select, a mobile platform purpose-built for off-duty law enforcement seeking flexible, high-quality job opportunities. Since its rollout, Protos Select has become a trusted solution for both off-duty law enforcement and agencies, simplifying off-duty shift management and creating new standards for transparency, speed and reliability.
Protos
Headquarters

383 Main Ave, Suite 505
Norwalk, CT 06851, USA
Phone: 203.941.4700

Protos
Headquarters

383 Main Ave, Suite 505
Norwalk, CT 06851, USA
Phone: 203.941.4700

Mark Hjelle

Chief Executive Officer

Mark Hjelle is the CEO of Security Services Holdings, LLC as well as Protos Security and its subsidiaries. Mark is an experienced Chief Executive Officer and Board Member who has led large national business and facilities services firms for nearly 25 years delivering strong top- and bottom-line growth while building high-performing teams with strong culture. Most recently, he was CEO for CSC ServiceWorks, a B2B2C provider of technology-enabled consumer services. Prior to CSC, Mark was President of Brickman/Valleycrest a national provider of exterior landscape and snow removal services. Over the course of his 18-year tenure at Brickman, he held numerous leadership positions in operations, finance and business development. Mark holds a Bachelor of Science degree in Economics from The Wharton School of Business, University of Pennsylvania, a Master of Government Administration from the University of Pennsylvania Fels Institute of Government and a Law Degree from Case Western Reserve School of Law.