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
Supervisor was very clear on explaining all that we needed to know and do.
trustpilot
Very informative and well organized.
trustpilot
It has been a real pleasure working with the Protos team. Any time I've had an issue, the team has been quick to assist. Protos is very transparent, and that is a hard quality to find in this industry when it comes to firm-to-firm relations, unfortunately.
trustpilot
Meeting and hearing from everyone. Everyone was very informative and nice. I look forward to the next one.
trustpilot
Professionalized leadership
trustpilot
After working with Protos for many years with A&A Security we have watched them grow with us and become a great partner. They’re very professional and fair with vendor and client accountability. Looking forward to continuing our partnership.
trustpilot
Great company to partner with.
trustpilot
Our experience working with Protos Security as a vendor has been consistently positive. They offer a well-balanced mix of ongoing and temporary work orders, providing steady opportunities for growth. The Protos team is reliable, professional, and communicative. Their customer support is strong, and they maintain regular check-ins with vendors to ensure expectations are met. We appreciate their transparency in sharing performance ratings and offering constructive feedback on areas for improvement.

Overall, Protos has proven to be a dependable and supportive partner in the security services industry.

Thank you Protos Team!
trustpilot
We have had the privilege of working with Protos Security Services as subcontractors in Texas, and the experience has been outstanding. From Vendor Management to Dispatch and the Service Department, their team is consistently professional, responsive, and solution-oriented. Their support and transparency have played a key role in our growth over the past few years. What truly sets them apart is their strong performance-driven culture and the way they treat us as true partners. Highly recommended!
trustpilot
We are pleased to highlight that Protos is the best security company we have partnered with, demonstrating excellent organization and consistently maintaining a positive financial relationship with us. Their reliability has been a significant asset to our operations.
trustpilot
The instructions were clear, and Morgan was especially helpful in explaining everything thoroughly. It’s clear that the company is attentive and committed to delivering excellent service, and I’m glad to be a part of the team. I’m looking forward to working together.
trustpilot
This is a great company with lots of opportunity. Only complaint is they say if you want net 15 terms then you take a discount for early payment, however there net 15 really comes out to net 20 so it's better to just do the net 30
trustpilot
Regular check-ins to review our performance and opportunities to continue working with us as a vendor. While we have not been able to take advantage, they always provide access to resources and services that would be difficult to obtain independently.
trustpilot
Working with Protos Security has been a great experience for our team. Communication is clear, expectations are well defined, and payments are always on time. Their platform is organized and easy to use, which makes scheduling and reporting smooth for both management and our guards. They treat their subcontractors with respect and professionalism, and it shows in how they run their operations. Highly recommend partnering with them if you're in the security industry.
trustpilot
If you’re looking for a reliable partner to handle the heavy lifting of sourcing and managing quality security contracts, I would highly recommend Protos. Their professionalism, attention to detail, and commitment to client satisfaction set them apart in the security contracting industry.
trustpilot
I learned a lot. It is easy to be part of protos with the help of your qualified staff communication.

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.