Reletter
Artwork for CISO SOS

I write to share practical insight with CISOs, cybersecurity professionals, corporate boards, and the C-suite on navigating cybersecurity risk management—while sustaining the judgment, resilience, and well-being required of security leaders.

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Substack
PricingFreemiumPublishesWeekly
Issues20Founded2 years agoLast Issue3 months ago
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Artwork for CISO SOS

Latest Issues

Demonstrating Due Diligence to a Defensible Standard of Care™️ in Agentic AI

Executive Summary

For thirty years, my professional mantra has been demonstrating due diligence to a defensible standard of care. This principle has guided security leaders through every regulatory cycle, every technology shift, and eve...

3 months ago

The 10-Second Reset Nobody Taught You in Leadership Training

You know the feeling.

Back-to-back incident bridges, a board presentation in 40 minutes, and your brain is still locked in threat-detection mode. Your shoulders are up near your ears. Your thinking has narrowed to the tactical. You need...

3 months ago

What a Murder Trial Taught Me About Cybersecurity Leadership

Understanding denial, moral injury, and the long game of telling the truth

A jury in Clark County, Washington returned a guilty verdict this week in a case I followed closely. A fire battalion chief strangled his wife in the middle of the...

4 months ago
2
Paid

The Essential Step Everyone Seems to Skip

“Risk assessment is hooey.”

— Donn Parker, SRI International

I remember how stunned we were when Donn—my colleague and a mentor—said this to the International Information Integrity Institute (I-4) consortium he founded.

The statemen...

4 months ago
6

What I Would Tell My Younger Self

If I could speak to my younger self—the one working late nights, collecting certifications, solving impossible problems, contributing to industry groups, and believing competence would eventually speak for itself—this is what I would say....

4 months ago
5
4

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  • Karen F Worstell

    Cybersecurity leadership insights on visibility, influence, burnout, ethics, and career sustainability. Written by a former CISO and cyber risk leader focused on the human side of security—and where systems quietly fail women in cyber.

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