Riley Cho
Editor in Chief
Keeps headlines honest and incidents narrated without theater.
About
CoreSignal Mainframe Newsroom started as a private editorial list for operations managers who wanted news beside training—not instead of it. We still behave like a newsroom: every bulletin ships with named editors, limitation disclosures, and revision history you can cite in change records.
Principles
- Quiet titles, loud clarity.
- Operations news and training share vocabulary.
- Limitations are part of the product.
- Korea-friendly scheduling is a feature, not an afterthought.
Org chart
Editorial & delivery
Riley Cho
Editor in Chief
Hana Suh
Mainframe Instructor
Jonah Lee
Enterprise Account Manager
Marcus Yi
Technical Curriculum Designer
Evelyn Park
Customer Success Lead
Faces behind the briefings
Hana Suh
Mainframe Instructor
Builds labs that survive skeptical night-shift reviews.
Jonah Lee
Enterprise Account Manager
Aligns Korea-friendly schedules with global follow-the-sun crews.
Marcus Yi
Technical Curriculum Designer
Turns production scars into teachable sequences.
Evelyn Park
Customer Success Lead
Translates bulletins into weekly rituals for member teams.
Milestones
- 2019●First private operations digest for Seoul enterprise clients.
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- 2022●Training bulletins catalog launched with named responsible editors.
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- 2025●Combined newsroom membership with readiness center resources.