Warren Edward Buffett (born August 30, 1930, in Omaha, Nebraska) is an American investor, businessman and philanthropist. He is regarded as one of the world's greatest stock market investors, and is the largest shareholder and CEO of Berkshire Hathaway. With an estimated net worth of around US$62 billion, he was ranked by Forbes as the richest person in the world as of March 5, 2008.

Often called the "Oracle of Omaha," Buffett is noted for his adherence to the value investing philosophy and for his personal frugality despite his immense wealth. His 2006 annual salary of about $100,000 is tiny by the standards of senior executive remuneration in other comparable companies, and when he spent $9.7 million of Berkshire's funds on a business jet in 1989, he jokingly named it "The Indefensible" because of his past criticisms of such purchases by other CEOs. He continues to live in the same house in the central Dundee neighborhood of Omaha that he bought in 1958 for $31,500, today valued at around $700,000.

Buffett is also a noted philanthropist. In 2006, he announced a plan to give away his fortune to charity, with 83% of it going to the Bill & Melinda Gates Foundation. In 2007, Buffett was listed among Time's 100 Most Influential People in The World. He also serves as a member of the board of trustees at Grinnell College, where his advice on asset management has led to Grinnell College having the second largest endowment of any liberal arts college in the United States.