Mark Zelden, Advisor System Engineer & z/OS team lead - DXC Technology

              Zelden (photo by Chip Williams)
Photo by Chip Williams

View Mark Zelden's profile on LinkedIn
Mark Zelden is an Advisor System Engineer and z/OS team lead for DXC Technology (formerly CSC / Computer Sciences Corporation), an accomplished senior systems programmer and a consultant with over 35 years of experience providing solutions for corporate IT organizations. Mark is ITIL V3 certifed and is an industry recognized leader in the MVS-OS/390-z/OS operating environment. He has a successful track record as a consultant and systems programmer with expertise in operating systems, Parallel Sysplex, security software, (RACF, Top Secret, ACF2), JES2, SMP/E, Workload Manager (WLM), networking (VTAM / NCP / TCPIP), DASD management, system software installation and support - including dozens of ISV software products, and technical applications support. Mark also has expertise in mainframe performance and tuning, capacity planning, technology strategy and planning, and problem diagnosis/resolution. His positions have required both independent, hands-on involvement and project leadership / management, and his strengths include a solid technical foundation coupled with strong people and interpersonal skills.

Mark has authored utility programs that have been included on the CBT tape, his own web site, Mark's MVS Utilities, that is one of the most recommended sites in the industry, and articles for publications like Xephon's MVS Update magazine, TSO Times, and IBM Systems Magazine. Mark is the Systems Programming expert on the panel of S/390 experts for the "Ask The Experts" feature of and the TechTarget Expert Answer Center for OS/390 and z/OS operating systems.

Mark and his web site have been featured in SHARE presentations / sessions over the years like "Cherylís Hot Flashes" and "Fully Wired System Programmer" and also in industry publications like Cheryl Watson's Tuning Letter and IBM Systems Magazine in an article called "The Legend of Zelden".

In Mark's current role with DXC he is the z/OS team lead supporting one of DXC's largest commercial client and also member of a global technology, infrastructure and service management team responsible for the design, development, deployment and operational governance of the services delivered to both new and existing accounts in support of service offerings.