Who was the most influential person of the 20th Century?

James Ritty He invented the cash register. : -) You should read his biography. Very interesting how the worlds entire retail system was shaped around it. He was also the first employer to implement the suggestion box as well. The way employers treat there employees also stems from the way he built his company. Very very interesting business man. I would forget Hitler, three other people will choose the same person. Go with James Ritty.