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.

John 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


Responding to changes in industry trends, Cadwell replaces the 5200A with the Sierra line, which continues to serve the global EMG market today.


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


Cadwell expands its Kennewick headquarters and hires international support teams in China, Singapore, The Netherlands and UAE. Cadwell releases the Arc EEG line for clinical, ambulatory and long term EEG monitoring.


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.


Cadwell releases the world’s first completely integrated electrodiagnostic system with ultrasound in its Sierra Summit.

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


Cadwell celebrates 40 years of delivering innovative neurodiagnostic, neuromonitoring, and sleep diagnostic solutions. Check out the party photos here.


The next generation of ApneaTrak HSAT is launched with completely disposable patient kits to help sleep labs deliver safe home testing solutions.


Cadwell acquires Sleepmate product line from Ambu A/S, and incorporates Sleepmate™ sensors and consumables into its sleep diagnostics solutions. Cadwell integrates EnsoSleep artificial intelligence into the Easy III PSG software to enable automatic AI scoring.


Cadwell upgrades Arc software and launches Arc Apollo+ EEG for LTM, EMU, ICU, NICU and in-home ambulatory monitoring.


Cadwell upgrades Sierra software and launches Sierra NMUS1, a robust dedicated neuromuscular ultrasound system integrated into the Sierra Summit electrodiagnostic testing environment.


Cadwell continues to expand, serving new markets and improving its products. The company stays true to its mission: Helping you help others.