William Henry "
Bill"
Gates III (born October 28, 1955) is an American business magnate, philanthropist, investor, and computer programmer. In 1975, Gates and
Paul Allen co-founded
Microsoft, which became the world's largest
PC software company. During his career at Microsoft, Gates held the positions of chairman, CEO and
chief software architect, and was the largest individual shareholder until May 2014. Gates has authored and co-authored several books.