Claim: Nikola Tesla worked on telecommunication technology in the US.
Evidence: Nikola Tesla -LRB- Никола Тесла 10 July 1856 -- 7 January 1943 -RRB- was a Serbian-American inventor , electrical engineer , mechanical engineer , physicist , and futurist who is best known for his contributions to the design of the modern alternating current -LRB- AC -RRB- electricity supply system.
Electrical engineering has now subdivided into a wide range of subfields including electronics , digital computers , power engineering , telecommunications , control systems , radio-frequency engineering , signal processing , instrumentation , and microelectronics.