Karl D. Swartzel Jr.

Karl Dale Swartzel Jr. (June 19, 1907 – April 23, 1998)[1] was the inventor of the operational amplifier (or 'op-amps'). He filed the patent for the 'summing amplifier' in 1941 when working at Bell Labs.[2]

References
  1. Karl D. Swartzel Jr. at Find a Grave
  2. US 2401779, Karl D. Swartzel Jr., "Summing amplifier", published 11 June 1941, assigned to Bell Telephone Labor Inc.


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