Jeff Chandler

Jeff Chandler is a trusted voice in cybersecurity, often invited to share his insights on podcasts, local news, and industry publications. As the Founder and CEO of Z-JAK Technologies, he leads a Louisville-based Managed IT Services Provider that helps small and mid-sized businesses stay secure, compliant, and future-ready in an increasingly risky digital world. At Z-JAK, Jeff and his team deliver cybersecurity-first, white-glove IT support to industries such as manufacturing, professional services, and law firms throughout the Louisville metro region. His philosophy is simple: protect businesses today while preparing them to thrive tomorrow. With over 40 years of experience as a developer, systems architect, business consultant, and insurance executive, Jeff brings a rare blend of technical expertise and business leadership. He previously served as Chief Technology Officer for Jefferson National Financial, where he was part of the startup team that built the company from the ground up and played key roles in its growth and success. Today, Jeff combines his deep technical knowledge with his passion for helping businesses succeed, guiding leaders to adopt technology and AI strategies securely, effectively, and with confidence.

How to Prep Microsoft 365 for a Safe Copilot Launch

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TL;DR: Microsoft 365 Copilot reads files, emails, and chats using each user’s existing permissions, and in most companies those permissions have quietly grown broader than anyone realizes. Before you turn Copilot on, audit who can access what, fix the access that has drifted out of scope, and label your confidential files. Skip that step and

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Local Admin Rights: The Hidden Cause of IT Tickets

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TL;DR: Giving employees local admin rights feels efficient, but it’s the root cause of your most expensive support tickets and your biggest endpoint risk. Removing admin rights stops most malware cleanups, self-inflicted config breaks, and compliance drift before they start. Just-in-time elevation covers the rare cases where someone needs to install something. The result is

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The Phishing Attack That Walks Right Through Your MFA

anonymous hacker cybersecurity vector

TL;DR: Adversary-in-the-middle (AiTM) attacks let criminals hijack a logged-in account even when multi-factor authentication is turned on. The attacker sits between you and the real login page, waits for you to sign in, then steals the session token that proves you did. The fix isn’t more MFA. It’s phishing-resistant MFA, tighter access rules, and watching

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