Mark Wilson

Mark Wilson is a globally recognized thought leader and international speaker in mainframe security and technology, as well as a passionate advocate for all things Z. With more than 40 years of experience, Mark serves as the Editor of Cheryl Watson's Tuning Letter and as the Technical Director at Vertali. He is a multi-year IBM Champion and a Planet Mainframe Influential Mainframer.

The bill for technical debt just came due

Jul 24, 2026 | Cost, Technical debt

“It still runs" no longer means "it’s still safe." Here is why AI-driven exploit discovery is turning decades of unpatched technical debt, legacy frameworks, and hidden API flaws into an immediate target list.This topic has been nagging at me for months, because it...

CICS. Db2. IPL. The Latest Cheryl Watson’s Tuning Letter

Mar 3, 2026 | Cheryl Watson's Tuning Letter, CICS, DB2, Performance, z/OS Tuning

The Latest Tuning Letter issue is out now! Subscribers to Cheryl Watson’s Tuning Letter will find the newest issue, 2026 No.1, on our Tuning Letter website. If you are not a current subscriber yet, sign up today! This subscription-only resource is available to both...

IBM’s decision to discontinue support for the zPDT standalone offering threatens the mid-tier ISV market

Nov 24, 2025 | Dev Ops, Modernization, News, z/OS

IBM’s zPDT Decision Risks Mid-Tier ISVs and Mainframe Innovation I’ve been a passionate mainframe (System z) advocate for over 45 years and a staunch supporter of IBM and most of their decisions. However, when I received an email from IBM on 30 September 2025...

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