Lev Sergeyevich Termen (Russian: Лев Сергеевич Термен, IPA; 27 August [O.S. 15 August] 1896 – 3 November 1993), better known as Leon Theremin, was a Russian inventor, most famous for his invention of the theremin, one of the first electronic musical instruments and the first to be mass-produced. He also worked on early television research. His secret listening device, “The Thing“, hung for seven years in plain view in the United States ambassador‘s Moscow office and enabled Soviet agents to eavesdrop on secret conversations.