Bill gates, held the title of the richest man in the world for a very long time with a networth of $59 billion. Bill gates is co-founder of microsoft, former CEO and curent chairman. Bill gates is married with 3 children. Bill gates is also co-founder of Bill & Melinda gates foundation. Bill gates has 66,000 sq ft. mega mansion off lake washington. The home cost an estimated $125 million to build.