Schweitzer Engineering Laboratories (SEL) is a 100% employee-owned company that designs and manufactures digital protective relays, control and monitoring systems, communications gear and software that protect electric power systems worldwide. Founded in 1982 by Dr. Edmund O. Schweitzer III — inventor of the first digital microprocessor-based protective relay — SEL is headquartered in Pullman, Washington, with roughly 6,000 employees across about 60 US locations and 50 international sites, plus its own semiconductor fabrication and printed-circuit manufacturing. Dave Whitehead serves as CEO and, since January 2025, also as President. Engineering hiring spans embedded firmware, power systems protection, hardware and ASIC design, industrial cybersecurity (SEL is a major OT security vendor), software and test automation.