Warren Edward Buffett (born August 30, 1930) is an American investor and businessman. Nicknamed the ‘Oracle of Omaha’ or the ‘Sage of Omaha,’ Buffett has amassed an enormous fortune from astute investments, particularly through his company Berkshire Hathaway, in which he holds a greater than 38% stake. With an estimated current net worth of around $42 billion, he is ranked by Forbes as the second-richest person in the world, behind only Microsoft chairman Bill Gates. In June 2006, he made the commitment to give away 85% of his fortune, most of which would be going to the Bill and Melinda Gates Foundation. This is the largest act ever of charitable giving in United States history.