Nikola Tesla

Real world
Nikola Tesla (July 10, 1856 – January 7, 1943) was an inventor and a mechanical and electrical engineer. He is best known for many revolutionary contributions in the field of electricity and magnetism in the late 19th and early 20th centuries. Tesla's patents and theoretical work formed the basis of modern alternating current (AC) electric power systems. At the time of his death, Tesla had been continuing his work on the teleforce weapon, or death ray, that he had unsuccessfully marketed to the US War Department. It appears that his proposed death ray was related to his research into ball lightning and plasma, and was imagined as a particle beam weapon.

Fallout world
In the 21st century, a Tesla armor was constructed for United States military use based on his plans. Though his plans looked completely insane, they worked like a charm. The result was a shining metal armor providing superior protection against energy attacks thanks to the three Tesla attraction coil rods which disperse a large percentage of directed energy attacks. Against conventional weaponry it acts as regular metal armor. Later, after the Great War, the Enclave constructed a Tesla power armor.

A book titled Nikola Tesla and You was published before the War, instructing readers how to operate various energy weapons (some of which, like the Tesla cannon, might have been based on Tesla's designs).