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 has shown to be a reliable source of consistent work.
trustpilot
This Company help us a lot, very honest, constructive,
thoughtful.We are very happy with them.
trustpilot
The communication between my company and Protos representatives that’s been going great for me
trustpilot
The working relationship with Protos Security.
The assignments are within our area of operations.
They are always trying to make things better for all parties.
trustpilot
The staff is competent and easy to work with.
trustpilot
Working with Protos has been an excellent experience. The team has made a significant impact by ensuring a smooth and seamless transition for my company. Their professionalism, responsiveness, and attention to detail have consistently exceeded expectations.
I would like to extend a special thank you to Erin from Compliance for her exceptional support throughout the process. Her guidance and diligence ensured that every step was handled meticulously, making the transition truly seamless and stress-free.
I sincerely appreciate the effort and support from the entire Protos team. It is clear that Protos values its partners and is committed to building strong, reliable relationships. Thank you for helping us move forward with confidence, and I look forward to continuing our partnership.
trustpilot
Working with Protos Security as a vendor has been a smooth and professional experience for God La Plus Security. From the start, their onboarding process was clear and easy to follow, with quick responses to any questions. Communication with their team is always prompt and helpful, making scheduling and assignments straightforward.

Payments are processed in an organized manner, and their technology platform provides real-time updates and transparency, which helps us manage our services efficiently
trustpilot
Proto's communication is great better than any company I have partnered with. They have helped my company grow tremendously over the course of 3-4 months; this was the best decision that could ever be made.
trustpilot
Protos is a great company to work with. They are professional, have a great team, and always have someone available to answer questions. Their system is easy to use, and I highly recommend Protos.
trustpilot
Working with Protos Security has been a great experience and has helped build our company. We appreciate your professionalism and reliability.
trustpilot
He took the time to answer my questions
trustpilot
Great company to be partnered with Protos Security, professional and friendly staff excellent customer service.

Greatly appreciated
Thanks, Protos Security
trustpilot
Surrender Protection inc
Protos Security is a great place to work.
trustpilot
I have been working with this company for last few months and my experience with them is excellent. The reason is as follows:
1. Well organized, from choosing the right partner and follow up with the team members very efficiently.
2. If the guards are tardy or doesn’t show up Protos make sure the site is not abandoned. They call others and make sure the site is covered (that’s from the clients site).
3. If the work orders has been signed and doesn’t inform the other party At least a said deadline, the client has has to go what was agreed on the contract (that’s great for the guard company).
Protos is very balanced company, unlike some others.
4. Payments are right on time.

trustpilot
Communication is great, account managers are receptive to feedback and eager to help.
trustpilot
PROTOS stands out as a unique company. Its well-structured organization and consistent reliability in payment make it a commendable choice for collaboration.

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.