Sentinel Risk Group is an independent operational resilience advisory practice — built on structured methodology, proprietary assessment tooling, and the discipline to translate operational complexity into executive clarity.
The organizations most at risk are often the ones that have never had their operational function assessed under realistic conditions.
SRG was founded on a single conviction: operational resilience requires a structured methodology, not a generic framework. We exist to give leaders an honest, structured picture of where they actually stand — and to build the continuity architecture that holds when conditions become most demanding.
SRG is not a security services company. It is not a product reseller. It is not a compliance firm. We assess how organizations and leaders actually function under pressure — not how plans say they should function. We identify likely failure pathways, prioritize mitigation sequencing, and provide a structured framework leadership can execute against. We are not measuring compliance. We are measuring operational reality.
Mark Apperson · Founder, Sentinel Risk Group
Mark Apperson founded Sentinel Risk Group on more than 24 years leading, assessing, and sustaining complex operations in environments where continuity, communication, and leadership decision quality were not preferences — they were operational requirements. As a U.S. Army Special Forces Team Sergeant and Operations Sergeant, he led teams in sensitive, high-consequence environments across multiple theaters, including sustained operations in austere regions where dependencies were real and the cost of poor decision architecture was immediate.
That experience informs how SRG thinks about organizational risk — not through the lens of controls or compliance, but through the lens of operational function under pressure. SRG’s methodology, anchored in the SORI™ scoring framework and structured across its operational domains, reflects that thinking.
These are the operating standards that govern every SRG engagement — built from environments where operational discipline, unconditional integrity, and commitment to the client’s actual outcome were not optional.
The client’s problem is the mission. We measure success by what changes in your risk environment — not by the weight of our report. We will never recommend a service you do not need.
We tell you what we found. All of it. Our findings are independent and ours alone. We will never shade an assessment to protect a relationship or win the next engagement.
We earn trust through execution. Your business is confidential. We will never reference your engagement without written authorization.
Complexity is expected. Every engagement receives our full effort from start to finish. We do not deliver incomplete work.
No two clients face the same threat environment. We build every assessment from scratch — around your actual reality, not a recycled framework.
People are the decisive terrain. We study the people, not just the systems. We listen before we advise.