William (Bill) H. Gates III is co-founder, chairman and chief executive officer of Microsoft Corporation, the world's leading provider of software for personal computer. was born on October 28, 1955. He and his two sisters grew up in Seattle. Their father, William H. Gates II, is a Seattle attorney. Mary Gates, their late mother, was a schoolteacher, University of Washington regent and chairwoman of United Way International. Gates attended public elementary school before moving on to the private Lakeside School in North Seattle. It was at La ....