Simeon Aisenstein

Simeon Aisenstein (25 January 1884, Kiev, Imperial Russia - 3 September 1962, Chelmsford, Essex, United Kingdom) born Семёна Моисеевича Айзенштейна (Semyon Moiseevich Aisenstein), was a pioneer and entrepreneur in radio and telegraphy transmission in Imperial Russia. In 1916 he was appointed manager of the Marconi Company in Russia but later moved to England where he spent most of his life working for Marconi's Wireless Telegraph Company and later on English Electric Valve Company which he founded in 1947. His major achievement was the development of valves (also known as tubes) for high power radio transmission. This allowed for the first time transmission to submarines using Very Low Frequencies (VLF), as well as Medium Wave (MF) broadcasting stations with a power of up to 500 kilowatts.