John Herold

John Herold is a Decatur-based controls and field service engineering practice serving industrial automation and mission-critical data center construction projects across North America. The firm works with owners, developers, and EPCs, bringing hands-on expertise in controls engineering, field service, commissioning, and systems integration to complex industrial and data center environments.

The practice publishes a weekly technical newsletter aimed squarely at working controls and field service engineers—people who want field-tested insights, project specifics, and credible technical depth rather than vendor marketing. Content spans industrial automation (PLC, SCADA, DCS), data center controls and commissioning, power and cooling integration, and field service practices drawn from real project experience.

John Herold's site goal is to establish the firm as a recognized authority among technical practitioners and project stakeholders, while growing qualified inbound inquiries from controls engineers, field service engineers, project developers, and senior energy and industrial executives who influence or approve engineering partners. The primary call-to-action across all content is newsletter signup, building a direct relationship with a technically fluent audience that values credibility over polish.