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According to a BBC documentry I once saw, the light bulb was in fact invented by an African American who worked in Edison's work shop...
Edison worked long hard hours and was probably a genius. I don't have the details but the African American I think you are talking about was the one who lite up London the way they did New York. When Edison won a Nobel Prize for science Tesla only said that he had earned at least four and its about time they recognized him.
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Tesla, although he was a genius, was a genius who worked in isolation. He had few friends and did not have Edison's ability to contect with people. I think this, as well as Edison's genius for self promotion (Tesla was once granted the Edison medal as a sign of recognition) is the reason why Tesla is a relative unknown.
Tesla is not so much unknown as incomprehensible. He had what is refered to as photo cognition and he could draw up schematics, blueprints and did experiments in his head. The trouble is we have very little, except his actual work, because of that. Tesla supposedly realized how AC power is possible from, of all things, the poetry of Gothe. He tried to explain it a couple of times but never was able to communicate it. I know he worked in Hungry on the phone systems there for a while before coming to America and working for Edison. He entered into a verbal contract with Edison where Edison was supposed to reward him for his work on DC power and when Tesla tried to collect Edison refused. Tesla, as the story goes, just tiped the brim of his top hat and went to work for Westinghouse. When Westinghouse got into trouble trying to compete with Edison Tesla turned over the patents and the rest is history.
Tesla is supposed to have made a resonance vibrating machine that only he understood. He put a prototype of it on the steel infrastructure of a building and the vibrations became so intense that the workers fled. He built a larger version and it shook the area so violently that by the time rescue workers found him he had completely destroyed it and nothing more is known of it.
Perhaps the best thing about Tesla was not the things he did but what he could have did and didn't.