I would heve to say W. Edwards Deming. Deming trained hundreds in Japan on statistical quality control techniques. In the US, when Ford sought to "make quality job one" they sought out his help. He explained that management was responsible for 85% of the quality problems in the company and as a result, the company changed its culture from the top down. Deming is widely recognized as the father of the Total Quality Management movement. He believed that when people focused on quality, rather than costs, costs tended to decrease and quality increases.