The History of Cadwell Industries, Inc.


John Cadwell, BSEE, MD, develops the world’s first microprocessor EMG in the basement of his Seattle home during his residency at the University of Washington School of Medicine. He partners with his brother, Carl Cadwell, DDS, to form Cadwell Laboratories. Their first product is the Cadwell 7000 EMG.

Since 1979, Cadwell owners John Cadwell and Carl Cadwell


The Cadwell 5200A puts Cadwell on the map. This small, powerful, robust and easy to use machine becomes the best-selling EMG machine ever made. The company outgrows its previous facility and moves into 909 N. Kellogg St. in 1986.

Cadwell opens new building in current location in 1986



Carl and John Cadwell win the U.S. Small Business Administration Small Business Person of the Year for Region X “for significant contributions as an outstanding small business person and for your dedicated support of small business.”


Cadwell sends the Quantum 84 IONM/EMG machine into outer space. It’s the only machine that functioned on the mission. Scientists around the world study Cadwell data.

Certificate: Space


Cadwell releases a dedicated surgical monitoring product. The Cascade provides the caliber of equipment that customers have been expecting, and Cascade IONM continues to dominate the U.S. market today.


Cadwell greatly improves the workflow efficiency of diagnostic test report generation with Sierra Wave’s introduction of Quick Report.  

2015 Cadwell expanded with a two-story addition to accommodate software engineers, hardware engineers, IT, training facilities, a large kitchen and a gym


John Cadwell and his wife Priscilla are nominated and win the Tri-Citian of the Year award for their dedication to community, local business and philanthropy.

John Cadwell and Priscilla Cadwell are awarded the Tri-Citian of the Year, the first time the award has been shared by a married couple


The next generation of ApneaTrak HSAT is launched with completely disposable patient kits to help sleep labs deliver safe home testing solutions. Cadwell continues to expand, serving new markets and improving its products. The company stays true to its mission: Helping you help others.
EEG EMG IONM PSG Neurodiagnostics

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