Raymond A. Heising

Raymond A. Heising (1888-1965) was an American electrical engineer born in Albert Lea, Minnesota. He earned a degree in electrical engineering from the University of North Dakota in 1912 and a master's degree from the University of Wisconsin in 1914, then worked for Western Electric and Bell Telephone Laboratories. He played a major part in developing radio-telephone systems for military use in the First World War and for transoceanic and ship-to-shore public service. He invented several modulation systems still in wide use, including the constant-current system that bears his name, and held over one hundred United States patents, among them the Class C amplifier. He researched ultra-short waves and piezoelectric crystal devices, served as president of the Institute of Radio Engineers in 1939, and kept working as a consulting engineer after retiring from Bell Labs in 1953.