Sebastien Deleersnyde

Distinguished security expert

Shaping security worldwide, a driving force in the global security community.

Meet the Fellow

Background

Sebastien (Seba) Deleersnyder, Co-founder and CTO of Toreon, is a distinguished security expert and influential teacher at the Data Protection Institute.

Holding a masters in software engineering from the University of Ghent, Seba advocates for holistic product security. As the founder of the Belgian OWASP chapter, former OWASP Foundation Board member, and co-founder of BruCON, he has been a driving force in shaping global AppSec communities.

Market Sector Focus

Technology & SaaS companies
Financial services
Healthcare and life sciences
Government and public sector
Critical infrastructure providers
Telecommunications
Energy and utilities
Insurance
Manufacturing
Nonprofit and international development organizations

Experience

With a strong engineering background, Seba has significantly shaped software security worldwide through his decade-long role as a highly rated Black Hat trainer and leader of the OWASP SAMM project.

At the Data Protection Institute, he delivers practical security training, helping organizations embed privacy by design. Currently, his training maximizes impact on product security by equipping practitioners with DevSecOps expertise and addressing the challenges of AI Threat Modeling.

Areas of Expertise

Application security strategy & program development
Threat Modeling (DICE, AI-enhanced, Whiteboard Hacking)
OWASP SAMM & Security maturity assessments
Secure by Design, SDLC, Developer enablement
DevSecOps & secure CI/CD integration
Security architecture & Design reviews
Security program development
Risk identification & Mitigation planning
Security training design & global delivery
Industry thought leadership & Community building

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