Most people who understand mainframes don’t write about them. Most people who write about technology don’t understand mainframes.

Niek de Greef does both. Thirty years as an IT architect, one published book, and a habit of explaining complex systems to people who have to make decisions about them.

Strategic Advisory & Consulting

I help IT executives and architects turn mainframe complexity into clear, confident strategy — with independent advice and no vendor agenda.

• Architecture roadmaps & transformation plans
• Mainframe modernisation strategy & platform decisions
• Executive briefings and decision documents

Training & Coaching

Practical, experience-led learning for architects and engineers who want to understand the mainframe and work with it confidently.

• Solution Architecture training
• Don’t Be Afraid of the Mainframe – Mainframe training program
• Group workshops & in-company sessions
• Online courses

Background

30+ years mainframe systems expertise. Lead architect for fifteen years. MSc Computer Science, MBA, Distinguished Chief Architect. Co-author of multiple IBM redbooks. Author of “Don’t Be Afraid of the Mainframe”.

---

📧 ndegreef@seneqa.nl
🔗 [LinkedIn Profile]
📚 Insights at [execpgm.org]