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Robert N. Hall
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<p>Robert Noel Hall (December 25, 1919 – November 7, 2016) was an American engineer and applied physicist. He demonstrated the first <a href="/facts/Laser_diode/TjHzJteV">semiconductor laser</a> and invented a type of <a href="/facts/Magnetron/8qd9pfsj">magnetron</a> commonly used in <a href="/facts/Microwave_ovens/nS1B3wp2">microwave ovens</a>. He also contributed to the development of <a href="/facts/Rectifiers/me8XDxND">rectifiers</a> for power transmission. </p>