Skip to Main Content
All Trimarc services are now delivered through TrustedSec! Learn more

Joe Sullivan

Senior Security Consultant

EXPERIENCE
Joe has over 20 years of experience in Information Security. He has worked in Incident Response, forensics, penetration testing, and security leadership as a CISO for a financial institution.

EDUCATION & CERTIFICATIONS

  • GIAC Penetration Tester (GPEN)
  • GIAC Strategic Planning, Policy, and Leadership (GSTRT)
  • GIAC Certified Forensic Examiner (GCFE)
  • GIAC Certified Incident Handler (GCIH)
  • GIAC Security Leadership (GSLC)
  • GIAC Cloud Penetration Tester (GCPN)
  • GIAC Public Cloud Security (GPCS)
  • GIAC Certified Web Application Penetration Tester (GWAPT)
  • Certified Information Systems Security Professional (CISSP)
  • CNSSI 4012 Senior Systems Manager
  • CNSSI 4013 System Administrator in Information Systems Security
  • CNSSI 4014 Information Systems Security Officer
  • NSTISSI 4011 Information Systems Security Professional
  • NSTISSI 4015 Systems Certifier

PROFESSIONAL AFFILIATIONS

  • GIAC Advisory Board, ISC2 

Joe also teaches leadership courses for the SANS Institute.

INDUSTRY CONTRIBUTIONS
Joe has presented at security conferences including Check Point CPX, Information Warfare Summit, and BSides.

PASSION FOR SECURITY
Joe’s passion for security started in Incident Response and forensics in the late ‘90s. Since then, he has developed a passion for offensive security, security leadership, and teaching others.

Featured Blogs And Resources

Discover the blogs, analysis, webinars, and podcasts by this team member.

Blog September 21 2023

Basic Authentication Versus CSRF

I was recently involved in an engagement where access was controlled by Basic Authentication. One (1) of the findings I discovered was a Cross-Site Request…

Read about this article
Blog June 27 2023

Introducing CoWitness: Enhancing Web Application Testing With External Service Interaction

CoWitness improves web application testing by capturing complete DNS and HTTP responses, revealing false positives and hidden vulnerabilities, and helping…

Read about this article
Events TrustedSec HQ | March 31 2026

ISC2 Cleveland Chapter Member Meeting - March 2026

ISC2 Cleveland Chapter March MeetupCome join us for our meetup! The ISC2 Cleveland Chapter is hosting an exciting in-person event for all cybersecurity…

Read about this article
Events March 19 2026

Discord Livestream - AMA: Incident Response

Ask us anything about incident response! Join us for an exclusive Discord Livestream with IR Practice Lead Ryan Macfarlane.

Read about this article
Webinars March 18 2026

Copilot Security: What to Know Before You Go

In this webinar, our experts will walk you through the critical groundwork needed before deploying Microsoft 365 Copilot. Learn how you can best prepare for…

Read about this article
Webinars March 04 2026

CMMC Challenges and Misunderstandings

During our next webinar, our experts will cover CMMC misunderstandings that are creating the most problems for defense contractors and subcontractors, from CUI…

Read about this article
Events TrustedSec HQ | February 24 2026

ISC2 Cleveland Chapter Member Meeting - February 2026

ISC2 Cleveland Chapter February MeetupCome join us for our meetup! The ISC2 Cleveland Chapter is hosting an exciting in-person event for all cybersecurity…

Read about this article
Blog February 24 2026

Building a Detection Foundation: Part 1 - The Single-Source Problem

The Uncomfortable Truth About Your Telemetry Let me start with an observation that might hit close to home. In my years working Incident Response cases and…

Read about this article
Podcasts February 23 2026

Security Noise - Ten Years: A Decade of Doing This

David Kennedy and Kelsey Segrue join us to discuss ten years of our podcast! We discuss how the cybersecurity space has evolved over the years and social media…

Read about this article
News February 20 2026

NewsNation - "Signal Sniffer" Tracks Pacemaker Signal

Authorities are employing multiple strategies to profile the kidnapper of Nancy Guthrie. TrustedSec Founder and CEO David Kennedy joined NewsNation to discuss…

Read about this article

Empower your business through better security design.

Talk directly with our experienced advisory consultants to learn how we can help.