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

[New & Improved] QR Code Phishing with Snail Mail Postcards

One of KnowBe4's long-term employees just send me a picture this morning of a postcard that sure looks like it's phishing, the good old-fashioned way: snail mail ! Here is the picture and ...

[Free Tool] Find out who falls victim to QR code phishing attacks with our QR Code Phishing Security Test

According to QRTIGER, an online QR code generator company, dynamic QR code scans increased 433% globally from 2021 to 2022. In 2022, the FBI released a warning that QR codes may be ...

New Top-Level Domains as Potential Phishing Risk

Google has recently introduced a set of new top-level domains: .dad, .esq, .prof, .phd, .nexus, .foo, .zip and .mov. They’re now available for purchase, and it’s the last two that are ...

Phishing Tops the List Globally as Both Initial Attack Vector and as part of Cyberattacks

A new report covering 13 global markets highlights phishing prevalence and its role in cyber attacks when compared to other types of attacks.

New “Greatness” Phishing-as-a-Service Tool Aids in Attacks Against Microsoft 365 Customers

This new phishing toolkit is rising in popularity for its effective realism in impersonating not just Microsoft 365, but the victim organization as well.

Large-Scale "Catphishing" that Targets Victims Looking for Love

For all the recent focus on artificial intelligence and its potential for deepfake impostures, the boiler room is still very much active in the criminal underworld.  WIRED describes the ...

KnowBe4 Celebrates Success of 60,000-Customer Milestone

We are thrilled to announce we have reached a milestone of 60,000 customer organizations globally, consisting of tens of millions of end users.

The Number of Phishing Attacks Continues to Grow at a Rate of 150% Per Year

The latest Phishing Activity Trends Report from the Anti-Phishing Working Group (APWG) shows an unrelenting upward trend in the number of phishing attacks per quarter.

CyberheistNews Vol 13 #20 [Foot in the Door] The Q1 2023's Top-Clicked Phishing Scams | INFOGRAPHIC

CyberheistNews Vol 13 #20 | May 16th, 2023 [Foot in the Door] The Q1 2023's Top-Clicked Phishing Scams | INFOGRAPHIC KnowBe4's latest reports on top-clicked phishing email subjects have ...

The Face Off: AI Deepfakes and the Threat to the 2024 Election

The Associated Press warned this week that AI experts have raised concerns about the potential impact of deepfake technology on the upcoming 2024 election. Deepfakes are highly convincing ...