Warren Buffett is an American business magnate, investor, and philanthropist. He is currently the chairman and CEO of Berkshire Hathaway. Since 1970, Buffett has presided as the chairman and largest shareholder of Berkshire Hathaway, one of America's foremost holding companies and world's leading corporate conglomerates. He has been referred to as the "Oracle" or "Sage" of Omaha by global media as a result of having accumulated a massive fortune derived from his business and investment success. He is noted for his adherence to the principles of value investing, and his frugality despite his vast wealth.