Warren Edward Buffett (born August 30, 1930) is an American investor, businessman, and philanthropist. He is one of the most successful investors in history, the primary shareholder and CEO of Berkshire Hathaway, and in 2008 was ranked by Forbes as the richest person in the world with an estimated net worth of approximately $62 billion. In 2009, Buffett was ranked as the second richest man in the United States with a net worth of $40 billion. However, this was after he donated billions of dollars to charity.

Buffett is often called the "Oracle of Omaha" or the "Sage of Omaha" and is noted for his adherence to the value investing philosophy and for his personal frugality despite his immense wealth. Buffett is also a notable philanthropist, having pledged to give away 85 percent of his fortune to the Gates Foundation. He also serves as a member of the board of trustees at Grinnell College.

In 1999, Buffett was named the top money manager of the twentieth century in a survey by the Carson Group, ahead of Peter Lynch and John Templeton. In 2007, he was listed among Time's 100 Most Influential People in the world.