26 March 2026

A New Australian Cyber Security Consultancy

By Greg Tereszczyn, Founder & Principal Consultant

We're launching TERESEC to address a gap we've seen repeatedly in the market: organisations operating in complex, high-stakes environments - critical infrastructure, energy, utilities, government - that need pragmatic, technically grounded cybersecurity advice, not just compliance checkbox exercises.

Why TERESEC?

The name reflects our approach:

Trusted Engineering for Resilience & Enterprise Security

Security is fundamentally an engineering discipline. Effective security programs are built on understanding how systems work, where they fail, and how adversaries think - not just on audit findings and policy documents.

What We Do

TERESEC offers cybersecurity consulting across:

  • IT Security Assessment - evaluation of enterprise IT infrastructure, identity systems, endpoints, and cloud against industry baselines
  • Vulnerability Management - risk-based programs that are operationally viable
  • Cyber Risk & Governance - GRC uplift grounded in NIST CSF, ISO 27001, and the Essential Eight
  • Security Architecture - independent review of network design, IAM, and cloud posture
  • Strategic Advisory / vCISO - senior expertise on demand
  • OT / ICS Security - assessments and architecture reviews aligned to IEC 62443 and NIST SP 800-82

Who We Work With

Our clients are in industries where security failures have operational and safety consequences - energy, resources, utilities, financial services, and government. We understand the constraints of OT environments: uptime requirements, legacy systems, air-gap considerations, and the gap between IT and operational teams.

Get in Touch

If you're looking for a security partner who understands both the technical and operational realities of your environment, we'd welcome the conversation.

Contact us to discuss your needs.

About the author

Greg Tereszczyn

Greg Tereszczyn is the founder and principal consultant of TERESEC, an Australian cyber security consultancy for small and medium business. He turns the Essential Eight, the ISM, ISO/IEC 27001, NIST CSF and IEC 62443 into plain-English advice a business can act on.

Greg Tereszczyn on LinkedIn

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