Contact A Security Expert

Contact Us 3 Column (Pardot-2025 new contact form)

Proven Security. Real Experiences.
Trusted Results.

At Protos, we strive to deliver measurable impact and unmatched service. From Fortune 500 companies to local businesses, our clients count on us for consistent, responsive and professional security services. Check out the reviews below to discover how we’ve delivered peace of mind and operational excellence to clients across North America.

trustpilot
Protos Evolve from time to time.
trustpilot
Protos is a good company to do business with
trustpilot
Excellence & professionalism.
trustpilot
Universal Security Training Academy highly recommends working with Caitlin Coogan and her team. Our experience has been nothing short of professional, efficient, and well-coordinated from start to finish.

Caitlin has demonstrated excellent communication and strong leadership throughout our interaction. She ensures that all expectations are clearly outlined and follows through with prompt responses and support whenever needed. Her attention to detail and commitment to maintaining strong vendor relationships truly set her apart.

We appreciate the level of organization and professionalism that Caitlin brings to every interaction. It is evident that she values quality service and takes pride in making sure everything runs smoothly. That kind of dedication makes a big difference when working in a professional environment.

Universal Security Training Academy looks forward to continuing this partnership and would confidently recommend Caitlin Coogan and her team to anyone seeking reliable and professional collaboration.

Thank you again for the opportunity to work together.
Ofc. James Universal Security Training Academy
trustpilot
This Company help us lotHappy to work with.
trustpilot
They are looking forward to help
trustpilot
Very clear and precise communication throughout the entire contract!
trustpilot
Professionalism, promptness and clear communication
trustpilot
Protos Security has proven to be a highly professional and well-structured organization to work with from a vendor perspective. Their team demonstrates a strong commitment to communication, operational efficiency, and maintaining high standards across the security programs they manage.

Throughout our interactions, the Protos team has been responsive, organized, and supportive during the vendor onboarding and coordination process. Their ability to effectively manage security services across large and diverse property portfolios shows a clear understanding of both client expectations and the operational realities of the security industry.

At Trident Protective, we place a strong emphasis on proactive security, professionalism, and building long-term partnerships with the organizations we serve. Working with a company like Protos Security that values those same principles helps create a collaborative environment where security providers can perform at their best while ensuring properties and communities receive reliable protection.

We appreciate the opportunity to partner with Protos Security and look forward to continuing to support their clients with high-quality security services.
trustpilot
I customer attention when calling very informative and helpful they give many plenty opportunities thank you
trustpilot
Dispatch is always quick to answer and always helps me out with any clock in and out issues we have. Their portal is super convenient and easy to navigate. 10/10
trustpilot
The response was a little slow but the result was excellent!
trustpilot
As a vendor for Protos I give them five stars because they've helped my business grow rapidly. The vendor relations team is excellent. The accounting department is excellent. We don't feel like we're alone. We feel like we are part of a team.
trustpilot
As a vendor they are always making sure we have the info needed to perform the service.
trustpilot
Great people's to work with
trustpilot
As the Manager of Operations for a vendor of Protos, I have to say its always a pleasure to work with the Protos team. They take care of my company and we take care of them with white glove treatment.

Showing our 4 & 5 star reviews

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.