Julien Ehrhart
AI Security Advisor at Thales Cyber Solutions Luxembourg
I help organizations secure their use of AI, and use AI to strengthen their cybersecurity, drawing on more than 25 years in tech, from building systems to breaking into them.
- Security for AI
- Architecture reviews of GenAI, LLM, RAG and agentic deployments, covering threat modeling, AI gateways, guardrails, model governance and EU AI Act alignment.
- AI for security
- Helping clients find and build AI use cases that strengthen their cyber defenses, from security automation across offensive, defensive and cloud operations to AI-assisted secure development.
- Offensive security
- 7 years leading the Intrusion & Application Security team at Excellium Services (Thales), managing 13 consultants. Red Team Leader on TIBER-EU engagements. Co-discovered 8 CVEs.
- Builder background
- Started as a .NET and SharePoint developer and architect (European Commission, PwC Luxembourg), so my advice is made to be implemented.
- Open source
- I publish Home Assistant apps running Firefox, Chromium and Thunderbird, with about 20,000 downloads of each new release. I also maintain the Spotcast integration, which I took over when its original author discontinued it.
- Speaker
- Conferences, webinars and interactive AI crisis simulations for boards and engineers. See my talks.