David M. Hadley

Cardea Associates, Inc. develops and provides medical devices. It offers a handheld electrocardiogram (ECG) device developed for screening young athletes’ hearts. The company was founded by David Hadley and Victor Froelicher and is headquartered in Woodinville, WA.

Quinton Cardiology Systems, Inc. develops, manufactures, markets and services diagnostic cardiology systems. Physicians, clinics and hospitals worldwide have relied on its products and services for nearly half a century. It markets its products under the Quinton and Burdick brand names