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, self-described "father of radio", and a pioneer in the development of sound-on-film recording used for motion pictures. he had over patents, but also a tumultuous career—he boasted that he made, then lost, four fortunes. he was also involved in several major patent lawsuits, spent a substantial part
famous invention, in , was the three-element " audion " ( triode ) vacuum tube , the first practical amplification device. although de forest had only a limited understanding of how it worked, it was the foundation of the field of electronics , making possible radio broadcasting , long distance telephone...
https://en.wikipedia.org/wiki/Lee_de_Forest