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

China Cybercriminals Behind Toll-Themed Smishing Attacks Surge in the US and UK

Resecurity warns that a China-based cybercriminal gang dubbed the “Smishing Triad” is launching a wave of road toll-themed SMS phishing (smishing) attacks against users across the US and ...

Lack of Security Awareness Tops List of Obstacles to Cyber Defense

Most organizations cite low security awareness among employees as the biggest barrier to defending against cyberattacks, according to a new survey by CyberEdge Group.

AI-Powered Spear Phishing Can Now Outperform Human Attackers

Researchers at Hoxhunt have found that AI agents can now outperform humans at creating convincing phishing campaigns.

UK Organizations Cite Phishing as the Most Disruptive Type of Cyberattack

Phishing was the most prevalent and disruptive type of attack experienced by UK organizations over the past twelve months, according to the British government’s Cyber Security Breaches ...

Hidden Threats in Our Power Grid: The Chinese Transformer Backdoor Scandal

America's critical infrastructure faces an unprecedented threat, and it's already installed in hundreds of locations across the nation.

Warning: QuickBooks Phishing Campaign Targets Taxpayers

Cybercriminals are capitalizing on tax season by launching phishing campaigns targeting QuickBooks users, Malwarebytes reports.

64% of Australian Organizations Hit by Ransomware Were Forced to Halt Operations

Illumio’s recent Global Cost of Ransomware Study found that 64% of Australian companies hit by ransomware had to shut down operations as a result.

Securing Employee Identities: Expert Tips for Identity Management Day 2025

With this week being Identity Management Day on April 8th, it's the perfect reminder for organizations to focus on protecting their employees' digital identities.

Russian Threat Actor Launches Spear-Phishing Campaign Against Ukrainians

The Russian threat actor Gamaredon is targeting Ukrainians with spear-phishing documents related to troop movements, according to researchers at Cisco Talos.