John Sotiropoulos is the Founder of Deep Cyber Ltd, safeguarding national-scale AI programmes across government, healthcare, and finance. He co-leads the OWASP Agentic Security Initiative, chairs the OWASP Top 10 for Agentic Applications, and is a Board Director of the OWASP GenAI Security Project.

John liaises with national cybersecurity agencies and has authored the UK Government’s Implementation Guide to the AI Cyber Security Code of Practice, now the ETSI EN 304 223 standard, and sits on the ETSI SAI technical committee shaping standards for secure AI and agentic systems. He was Highly Commended for Security Professional of the Year at the 2025 UK IT Awards, and is the bestselling author of Adversarial AI Attacks, Mitigations, and Defense Strategies.