Walter H. Schottky
Walter Hermann Schottky (23 July 1886, Zürich, Switzerland – 4 March 1976, Pretzfeld, West Germany) was a German physicist who played a major early role in developing the theory of electron and ion emission phenomena, invented the screen-grid vacuum tube in 1915 and the pentode in 1919 while working at Siemens, co-invented the Ribbon microphone and Ribbon Loudspeaker along with Dr. Gerwin Erlach in 1924 and later made many significant contributions in the areas of semiconductor devices, technical physics and technology.
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“Whoso taketh in hand to frame any state or government ought to presuppose that all men are evil, and at occasions will show themselves so to be.”
—Sir Walter Raleigh (1552–1618)