Some amazing characters that made breakthroughs in Electronics
John Bardeen - with William Shockley and Walter Brattain for the invention of the transistor. Fundamental theory of conventional superconductivity.
John Ambrose Fleming - invented the first thermionic valve vacuum tube.
Nikola Tesla - High voltage, Induction motors, wireless, AC power, Tesla Coil, etc
Robert Noyce - invented the first monolithic IC chip in 1959.