Senior security counsel.
Built deliberately small.

Blaine Brennecke is a senior security executive whose career has been built where strategic leadership and deep technical operations meet — an unusual combination that defines how Gatehaus approaches every engagement.

His career has been spent in regulated financial services, in a senior security operations capacity at a fintech that moves more than $16 trillion in payments annually for banks, financial institutions, and corporate clients. He holds named accountability for defensive operations — the security functions that protect that infrastructure against the adversaries who target payments systems specifically because of what they carry. Operating in heavily regulated environments — including the SWIFT Customer Security Programme, FFIEC examination cycles, and federal banking oversight — means building and running security capability that performs under regulatory scrutiny and adversarial pressure simultaneously, every day, with personal accountability for the outcome.

His scope spans the disciplines that matter to a modern enterprise security function: security operations leadership, SIEM and detection architecture, incident response, threat intelligence, and the AI security and governance work increasingly central to enterprise defense. He has built and matured Security Operations Centers, designed enterprise SIEM and detection architectures, led digital forensics and incident response through high-stakes events, stood up threat intelligence functions that produce decision-grade output for senior leadership, and architected the AI security enablement programs that increasingly define modern security strategy — not as an outside advisor recommending frameworks, but as the executive accountable for delivering results across multi-year programs.

At the strategic level, Blaine brings the boardroom credibility and regulatory fluency that high-stakes engagements demand. He has produced board-level threat intelligence products on geopolitical risk to critical infrastructure, briefed executive committees on emerging AI-enabled threats, and translated complex technical posture into the business and fiduciary language that directors require. This dual fluency — operational depth paired with executive-level communication — is the foundation of the Gatehaus advisory model.

What distinguishes his counsel further is the technical depth underlying that strategic credibility. Blaine remains operationally fluent in the most demanding specializations in cybersecurity — including malware reverse engineering at the binary level, advanced and strategic open-source intelligence collection, and the forensic methodology that legal and incident matters require — rather than having stepped away from the work into pure management. That fluency is preserved deliberately. When Gatehaus evaluates a threat, the analysis is not delegated to a junior analyst or filtered through a vendor’s summary. It comes from someone who has personally examined adversary tooling, mapped exposure the way a sophisticated adversary would, and made decisions in the moments where milliseconds matter.

Blaine holds a Master of Business Administration in Information Technology Management and a Master of Science in Cybersecurity, on a foundation of a Bachelor of Science in Cybersecurity. His professional credentials span the senior-practitioner standard (CISSP, CCSP) and an unusually deep set of GIAC operational specializations covering security operations management, cyber threat intelligence, strategic open-source intelligence, reverse engineering of malware, defending against advanced threats, and machine learning engineering. The combination — management-track and deeply technical, side by side — is rare. The dual-master’s foundation reflects something important about how he approaches the work: cybersecurity is a business discipline, not just a technical one. The best security programs are the ones that align with how an organization actually operates — and, in private client work, how a principal and their family actually live.

He is based in Massachusetts.