I would say Elon Musk via his development of Tesla (first modern viable electric car) and of SpaceX (first almost fully reusable low cost space solution). They are different "type" than the ones you quote, but the sheer magnitude and long term impact of both those companies will likely reverberate for decades to come.

Elon Musk, the South African that builds a lot of his cars in China?

It's hard to assign an achievement to a specific country unless it's a government project.

By that metric Saturn was built by the German that bombed London.

I'm not a Tesla fanboy, but Tesla is an American company.