Bill Gates

• With his wife Melinda, Bill Gates chairs the Bill & Melinda Gates Foundation, the world's largest private charitable foundation.
• The foundation works to save lives and improve global health, and is working with Rotary International to eliminate polio.
• Gates has sold or given away much of his stake in Microsoft -- he owns just over 1% of shares -- and invested in a mix of stocks and other assets.
• He remains a board member of Microsoft, the software firm he founded with Paul Allen in 1975.
• In late 2016, Gates announced the launch of a $1 billion Breakthrough Energy investment fund with about 20 other people.