Who is Walter Gieseking from The Great Pianists and what is their importance?

Walter Gieseking was a pianist who played piano at four, could read and write at five, and decided he never needed to learn any more after that. He had one of the fastest musical minds that could memorize a work overnight and never practiced more than four hours a day. He was famous for mastery of composers Debussy, Mozart, and Ravel. Gieseking lost much public acclaim after World War II when his German heritage stirred crowds to protest his concerts in the United States.