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

Cyber Insurance Expected to Continue to Rise as Sophistication and Cost of Ransomware Attacks Increase

New data about the state of cyber insurance shows that given the current loss ratios by insurers – and the reasons behind those losses – will result in higher premiums for the foreseeable ...

Experian Customer “Impersonation” Account Takeover Uncovered by KrebsOnSecurity

After a few notifications of a potential problem with Experian by his readership, Brian Krebs and team checked out Experian’s account signup process and found some disturbing news.

A Widespread, Multistage Investment Scam

A complex and ambitious investment scam has used more than 10,000 domains to induce speculators to give up not just funds, but personal information as well. Researchers at security firm ...

Happy 23rd Annual SysAdmin Day from KnowBe4!

It's been 23 years of celebrating all of our fellow System Administrators! Your hard work on daily maintenance of your company's day-to-day computer operations definitely deserves kudos.

Your KnowBe4 Fresh Content Updates from July 2022

Check out the thirteen new pieces of training content added in July, alongside the always fresh content update highlights and new features.

Phishing-Based Data Breaches Take 295 Days to Contain and Breach Costs Soar to $4.91 Million

Fresh data on data breach costs from IBM show phishing, business email compromise, and stolen credentials take the longest to identify and contain.

Microsoft 365 Users are Once Again the Target of Phishing Scams using Fake Voice Mail Messages

Using a simple email containing a voice mail attachment, an ingenious phishing attack captures credentials while keeping track of the domains being attacked.

Hackers Use Free Email Accounts from QuickBooks to Launch Spoofed Phishing Attacks

A new attack uses one brand email domain to increase the chances of reaching an Inbox, while spoofing another brand to trick users into transitioning to a vishing attack.

Spear Phishing Campaign Targets Facebook Business Accounts

Researchers at WithSecure have discovered a spear phishing campaign targeting employees who have access to Facebook Business accounts. The attackers are targeting specific employees, and ...