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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
This company is very helpful
trustpilot
The people at Protos are fantastic.
Always one step a head.
trustpilot
Protos is just exceptional!!!
It’s a real pleasure of working with Protos Security as a partner and I can’t be more satisfied with this partnership. The team is prompt, communicative, and attentive to every detail of every post, and they always want to be sure that the client is 100% satisfied.
Protos Security demonstrated a deep understanding of best practices in the industry, providing thorough assessments and tailored solutions that perfectly fit the clients' needs.
They are always trying to perfectionate details based on experience and expectations.
trustpilot
We have proudly partnered with Protos Security in California for over two years and have consistently had a positive experience working with their team. Protos demonstrates a high level of transparency, accountability, and professionalism in all aspects of their operations.

Their staff is highly responsive, knowledgeable, and supportive, which makes coordination smooth and efficient. Additionally, their applications and systems are very user-friendly, allowing operational tasks to be handled quickly and effectively.

We truly value our partnership with Protos Security and appreciate the professionalism and reliability they bring to every interaction.
trustpilot
Great service providing work for us as business owners.
Would highly recommend Protos as our vendor!
trustpilot
Protos consistently puts us vendors first!!
trustpilot
Top Notch security services all round the clock.
trustpilot
The dispatchers are very professional.
trustpilot
We so happy working with protos security for last 5 yrs.protos company is the highest company get work from them they are so professional
trustpilot
Gabriel went above and beyond to make sure our services were in sync.
trustpilot
Great company to partner with
trustpilot
Always there to deal with any issues
trustpilot
Amazing Company superior staff the best in the industry
trustpilot
We just want to thank Protos for your trust & confidence and looking forward to more Perms in the future thank you.
trustpilot
Protos time is accurate. Payment comes on time.
trustpilot
Protos Security has been a reliable and professional vendor to work with. Their team demonstrates strong communication, quick response times, and a clear commitment to supporting their partners. They are organized in coordinating security coverage and consistently work to ensure that client needs are met efficiently.

We appreciate their professionalism, transparency, and willingness to collaborate to improve operations and grow business opportunities. Working with Protos Security has been a positive experience, and we look forward to continuing our partnership and expanding our accounts together.

Guard for America team

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.