Combustion Engineering (C-E) was a multi-national American-based engineering firm and a leader in the development of both fossil and nuclear steam supply power systems in the United States with approximately 42,000[10] employees worldwide. Originally headquartered in New York City, C-E moved its corporate offices to Stamford, Connecticut in 1973. C-E owned over three dozen other companies including Lummus Company, National Tank Company and the Morgan Door Company. Former workers have gone on to hold leadership positions in major engineering firms and governments around the world. The company was acquired by Asea Brown Boveri in early 1990.The boiler and fossil fuel businesses were purchased by Alstom in 2000, and the nuclear business was purchased by Westinghouse Electric Companyalso in 2000.