Tim Callan

Tim Callan is Chief Compliance Officer at Sectigo and co-host of the popular PKI and security podcast “Root Causes.” Tim has more than 20 years of experience in leadership positions for prominent PKI and digital certificate technology providers including VeriSign, Symantec, DigiCert, and Comodo CA. A security blogger since 2006, he is a frequently published author of technology articles and has spoken at conferences including the RSA Security Expo, Search Engine Strategies, ClickZ, and the Internet Retailer Conference and Expo. A founding member of the CA/Browser Forum, Tim played a key role in the creation and roll out of Extended Validation SSL in the late 2000s.

How to stop ransomware - Seven steps to protect your enterprise

Tim Callan

September 27, 2021

There are seven steps that will help your company fight off ransomware attacks.

Machine identities: What they are and how to use automation to secure them

Tim Callan

August 16, 2021

Security teams who aim to control secure access to networked applications and sensitive data often focus on the authentication of user credentials. Yet, the explosive growth of connected devices and machines in today’s enterprises exposes critical security vulnerabilities within machine-to-machine communications, where no human is involved.

LIVE: August 19, 2026 at 2 PM EDT We'll examine where AI can deliver meaningful value, where incomplete context or black-box reasoning can introduce risk, and what governance, validation, and evidence-traceability controls organizations should establish.

LIVE: August 25, 2026 at 2 PM EDT Learn why critical infrastructure security has become a national security imperative, and the strategies organizations can adopt to improve visibility, collaboration, and response across their security operations.

Tim Callan

ARTICLES

How to stop ransomware - Seven steps to protect your enterprise

Machine identities: What they are and how to use automation to secure them

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