Recognized as one of the fathers of the modern digital computer for his work with Bell Labs in the 1930s and 1940s, Stibitz completed a relay-based calculator in November 1937 he dubbed the "Model K" (for "kitchen table", on which he had assembled it), which calculated using binary addition. Bell Labs subsequently authorized a full research program in late 1938 with Stibitz at the helm. Their Complex Number Calculator, completed January 8, 1940, was able to do calculations on complex numbers.
In a demonstration to the American Mathematical Society conference at Dartmouth College on September 11, 1940, Stibitz used a teletype to send commands to the Complex Number Calculator in New York over telephone lines. It was the first computing machine ever used remotely over a phone line. (See the commemorative plaque and the hall where this event took place in the photos below.)
Stibitz held 38 patents, in addition to those he earned at Bell Labs. He became a member of the faculty at Dartmouth College in 1964 to build bridges between the fields of computing and medicine, and retired from research in 1983. Replicas of the "Model K" reside in both the Smithsonian Institution and the William Howard Doane Library at Denison University.
