LIBERTY — Sealevel Systems Inc., a leading provider of rugged, industrial-grade computing and I/O solutions, is celebrating its 40th anniversary in 2026.

As Sealevel commemorates its past and future with ayear-long 40th anniversary campaign, “Forty & Forward,” the company will honor the people, products and partnerships that have defined its first four decades and support its future-ready vision as a trusted partner. Together, they represent a history of reliable, American-made technology for mission-critical needs and the strength that will sustain Sealevel’s momentum in the years ahead.

Husband and wife Tom and Susan O’Hanlan founded the company in 1986. A patent-holding inventor, Tom designed the first-of-its-kind RS-422/485 communication adapter for early IBM PCs, laying the cornerstone for Sealevel’s forward-thinking innovation. That small component was a giant step in how computers communicated, opening the door beyond office tasks and into automation, monitoring, control, and data collection across demanding environments.

Built on Tom’s vision for connectivity and with Susan’s support helping turn that vision into a long-lasting business, Sealevel has grown into a global provider of rugged edge

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