Adaptive cyber resilience

Interim cybersecurity leadership and operational transformation

I am Jelle Niemantsverdriet. I help organisations navigate critical security transitions through hands-on leadership, operational transformation, and strategic advisory.

Whether you're between CISOs, building incident response capability, or transforming security culture from compliance burden to business enabler - I bring 20 years of operational credibility (Fox-IT, Verizon) and strategic perspective (Deloitte, Microsoft National Security Officer NL).

Why this works

The best security teams operate like totaalvoetbal: versatile, adaptive, collaborative. Every team member can shift roles and responsibilities as needed, much like football players who interchange positions seamlessly. This flexibility allows cybersecurity teams to respond dynamically to threats, adapting strategies in real-time and ensuring comprehensive coverage across all fronts.

But traditional security organisation often fails here. The "3 lines of defence" model frequently becomes 3 layers of excuse, where accountability gets diffused and decision-making slows. Totaalcyber is different.

The approach emphasises:

• Collaboration and communication – Security isn't siloed; it's integrated with business operations
• Continuous learning and adaptation – You only get better by doing, by provoking your systems and teams, by preparing for the unexpected
• Resilience over rigid control – Systems that adapt and recover under pressure, not just prevent

In essence, Totaalcyber transforms cybersecurity from a rigid, segmented discipline into a dynamic, unified effort. It empowers organisations to navigate the complex cyber threat landscape with agility and confidence, much like a well-coordinated football team outmaneuvering its opponents on the field.

Want to understand where this thinking comes from? Read about my background.

What this looks like in practice

Interim CISO / security leadership – Step in as security leader during transitions. Executive leadership, operational oversight, crisis management, and hiring support.

Incident response & security operations leadership – Lead IR/SOC teams through crisis or capability building. Hands-on operational leadership, not just process design.

Security transformation & operational improvement – Transform security from compliance burden to business enabler. Strategic direction and operational improvements.

Strategic advisory / advisory board – Ongoing counsel without full-time commitment. Quarterly strategic reviews, operational assessments, on-demand advisory.

See the full Services page for details on engagement models and recent work.

Thought leadership

I also share insights on security transformation, resilience, and human-centred approaches through keynotes, podcasts and articles. See Talks and articles for recent recordings and publications.

Let's talk

If you're navigating a critical transition, I'd be happy to explore how I can help.

Email: jelle@totaalcyber.com
LinkedIn: https://www.linkedin.com/in/jelleniemantsverdriet/
Location: Amsterdam, Netherlands