Simeon Aisenstein (sometimes Eisenstein) (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. Following the Bolshevik seizure of power in 1917 Aisenstein, Aisenstein remained active in Russia and participated in the building of the Shukhov Tower.^[1] However in 1921 he left Soviet Russia for England.^[2]

Simeon Aisenstein started work on Radio telegraphy from the age of 16, in 1900 while attending the University of Kiev. He started out with a using a coherer receiver and radio transmitter. He obtained his first provisional patent in 1904 and established his first laboratory in Kiev.^[3] General Vladimir Sukhomlinov took an interest in his work. ^[4] He continued his education at Charlottenburg Polytechnic in Berlin.^[2]

In 1907 Aisenstein founded the “Society of Wireless Telephones and Telegraphs of the S. M. Aisenstein System” with support from the industrialists, industrialist Georgy Tishchenko and Pavel Gusakov.^[3] In 1908 this became the Russian Society of Wireless Telegraphs and Telephones (ROBTiT).

He 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. ^[5]