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

[HEADS UP] North Korea Expands Its Fraudulent IT Worker Operations

North Korea’s fraudulent employment operations have expanded to hit countries around the world, with a particular focus on Europe, according to researchers at Google’s Threat Intelligence ...

Your KnowBe4 Compliance Plus Fresh Content Updates from March 2025

Check out the March updates in Compliance Plus so you can stay on top of featured compliance training content.

Upgraded Phishing-as-a-Service Platform Drives a Wave of Smishing Attacks

A phishing-as-a-service (PhaaS) platform dubbed ‘Lucid’ is driving a surge in SMS phishing (smishing) attacks, according to researchers at Prodaft.

Online Gaming Platform Steam Tops List of Most Imitated Brands For the First Time

Steam was the most impersonated brand in phishing attacks during the first quarter of 2025, according to a new report from Guardio. The researchers note that the gaming platform’s surge ...

Your KnowBe4 Fresh Content Updates from March 2025

Check out the 58 new pieces of training content added in March, alongside the always fresh content update highlights, new features and events.

Phishing Attacks Lead to Theft in the Shipping Industry

Phishing attacks are driving a surge in “double brokering” scams in the shipping industry, according to Christian Reilly, Cloudflare’s Field CTO for EMEA.

[Heads Up] QR Code Phishing is Getting More Stealthy Fast

Attackers are using new tactics in QR code phishing (quishing) attacks, according to researchers at Palo Alto Networks’ Unit 42.

Most Phishing Emails Rely Purely on Social Engineering

99% of phishing emails that reached inboxes last year did not contain malware, according to a new report from Fortra.