Warren Buffett

Known as the "Oracle of Omaha," Warren Buffett is one of the most successful investors of all time. Buffett runs Berkshire Hathaway, which owns more than 60 companies, including insurer Geico, battery maker Duracell and restaurant chain Dairy Queen.The son of a U.S. congressman, he first bought stock at age 11 and first filed taxes at age 13.He's promised to give away over 99% of his fortune. In 2019 he donated $3.6 billion, much of it to the foundation of friends Bill and Melinda Gates.In 2010, he and Gates launched the Giving Pledge, asking billionaires to commit to donating half their wealth to charitable causes.