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] 2021 Tokyo Olympics Mean Olympic-Themed Phishing Attacks

Last year, we reported that authorities warned of the Tokyo Olympics phishing attacks. Then the global pandemic occurred, and the games were postponed. Well, now the games have ...

Mint Mobile, Porting Numbers, and Identity Theft

US telecommunications company Mint Mobile warned some users that their phone numbers had temporarily been ported to another carrier by an unauthorized individual, which allowed the ...

Microsoft Continues to be the Top Impersonated Brand in Phishing Attacks

New data from CheckPoint identifies those brands being used by threat actors to trick victims into opening attachments, clicking links, providing credentials, and giving up personal ...

The Cost and Impact of Cybercrime Can Now Be Measured in a Single Minute

With the number of threat actors growing rapidly, along with an increased frequency of attacks, RiskIQ has put together a sobering perspective of how cybercrime impacts us in just 60 ...

[INFOGRAPHIC] New Report Shows Users Are Falling for Security and HR-Related Phishing Attacks

KnowBe4's latest quarterly report on top-clicked phishing email subjects is here. These are broken down into three different categories: social media related subjects, general subjects, ...

New LuminousMoth APT Takes a Double-Infection Vector Approach to Attacks

Spotted by security researchers at Kaspersky Labs, this large-scale yet extremely targeted campaign of attacks focuses on government organizations within Southeast Asia.

Nearly Every Organization Has Had an Insider-Caused Data Breach in the Last Year

Whether it’s from an accidental leak of data or falling victim to a phishing attack, new data from email security vendor Egress puts the insider’s role in breaches into critical ...

Facebook Disrupts Iranian Social Engineering Operation

Facebook has taken down an operation by Iranian hackers targeting military, defense, and aerospace entities, particularly focused on the US.

[On-Demand Webinar] 2021 Phishing By Industry Benchmarking Report

As a security leader, you have a lot on your plate. Even as you increase your budget for sophisticated security software, your exposure to cybercrime keeps going up. IT security seems to ...