KnowBe4 Blog

Keeping you informed. Keeping you aware.
Stay on top of the latest in human and agent security including social and prompt engineering, ransomware and phishing attacks.

Stu Sjouwerman

Founder and Executive Chairman

Stu Sjouwerman (pronounced “shower-man”) is the Founder and Executive Chairman of KnowBe4, Inc., which hosts the world’s most popular integrated security awareness training and simulated phishing platform, with over 54,000 organization customers and more than 50 million users. A serial entrepreneur and data security expert with 30 years in the IT industry, Stu was the co-founder of Inc. 500 company Sunbelt Software, a multiple award-winning anti-malware software company that was acquired in 2010.


Recent Posts

Great 'Defense-in-Depth' InfoGraphic

Updated June 17, 2026

Surface Web vs. Deep Web vs. Dark Web: Differences Explained

These three terms are often a source of confusion, especially in connection with cybercrime and where that comes from.

Yes, that email is really from LinkedIn. Yes, it's really malicious.

By Eric Howes, KnowBe4 Principal Lab Researcher. Several months ago threat researchers at Proofpoint made a startling discovery : the bad guys had figured out a way to turn Paypal itself ...

The 7 Levels Of Hackers

Eric Chabrow over at the Government Info Security blog found an interesting post by Stuart Coulson, who is a director of a hosting provider in the U.K. Coulson wrote a somewhat longish ...

Crelan Bank Loses 75.8 Million Dollars In CEO Fraud

The Belgian Crelan Bank was the victim of a 70 million euro (75.8M U.S.) fraud that was launched from another country. They claim this CEO Fraud was discovered during an internal audit ...

How To Create Strong, Complex Passwords to Protect Your Organization

First, some best practices: Enable phishing-resistant multifactor authentication (MFA) whenever possible If you can, use a password manager and protect it with MFA and/or a long ...