John Ambrose Fleming

John Ambrose Fleming

Born: November 29, 1849

Died: April 18, 1945

Nationality: English

Occupation: Inventor

Biography: Sir John Ambrose Fleming FRS was an English electrical engineer and physicist. He is known for inventing the first thermionic valve or vacuum tube, the diode, then called the kenotron in 1904. He is also famous for the left hand rule.