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
The people at Protos are great.
Very helpful.

trustpilot
I had a great meeting with Protos Security
trustpilot
Universal Security training academy has a great partnership with Protos as we work as a team we are number 1 together.
trustpilot
We love working with Protos Security as we have been in partnership for many years and always a pleasure. The team is excellent in communication and attention to details in every assignment. The team is professional, honest, helpful wonderful 24/7 dispatch assistance the list goes on!! We value the relationship we have and look forward to many more years highly recommend them.
trustpilot
Protos is a great organization to work with. They are very professional and always go above and beyond for their vendors. I highly recommend Protos to any potential vendor or new client.
trustpilot
Perfect communication and respond
trustpilot
Company does well giving us precise and accurate information when giving us assigmments.
trustpilot
Working with Protos Security has been an excellent experience. Their team is professional, reliable, and communicative. We truly appreciate their attention to detail and commitment to customer satisfaction, and we highly recommend their services.
trustpilot

Working with Protos security has been an excellent experience. Their team is professional, reliable, and easy to communicate with. We appreciate their attention to detail and commitment to customer satisfaction. We look forward to continuing our partnership and highly recommend them to others.
trustpilot
Protos provide the best possible solution to vendors and disparate excellent
trustpilot
Kelly Audria was great to work with by providing all needed details within her email nd via phone as well.
trustpilot
Great Company I value the relationship Our company have,
trustpilot
Always available to provide work and information
trustpilot
Great to hear from the advocate today everything was given i needed to get done.
trustpilot
“Clear, Concise, and Helpful”
trustpilot
Great customer service and immediate attention

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.