 From college, MacCracken went to work at General Electric Corporation, where he designed the first combustion chamber and throttled the first jet engine.In 1947, MacCracken left General Electric to found Jet Heat Inc. (now known as CALMAC Corp.) in Englewood, New Jersey.In the following 50 years as CEO of CALMAC, he produced over 250 inventions and had 80 patents.