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]