Warren Buffett

    Warren Buffett
  • CEO, Berkshire Hathaway
  • Age: 83
  • Source of Wealth: Berkshire Hathaway, self-made
  • Residence: Omaha, NE
  • Country of Citizenship: United States
  • Education: Bachelor of Arts / Science, University of Nebraska Lincoln; Master of Science, Columbia University
  • Marital Status: Widowed, Remarried
  • Children: 3
  • Profile
     Neither age nor prostate cancer slows Warren Buffett down: a year after completing radiation treatment, the world's fourth richest man ($58.5 billion) is still doing huge deals. His Berkshire Hathaway teamed up with 3G Capital to pick up iconic ketchup maker H.J. Heinz for $23.2 billion

Carlos Slim Helu & family

    Carlos Slim Helu & family
  • Honorary Chairman, América Móvil
  • Age: 74
  • Source of Wealth: telecom, self-made
  • Residence: Mexico City, Mexico
  • Country of Citizenship: Mexico
  • Education: Bachelor of Arts / Science, Universidad Nacional Autonoma de Mexico
  • Marital Status: Widowed
  • Children: 6
  • Profile
    Carlos Slim Helu holds the title of the world's second richest man (net worth $69 billion), having lost the world's richest spot to Bill Gates in May. The biggest chunk of Slim's fortune lies in telecom. He also owns mining, financial, industrial and real estate companies, plus a stake in the New York Times.

David Cameron

    David Cameron
  • Prime Minister, United Kingdom
  • Age: 47
  • Residence: London, United Kingdom
  • Country of Citizenship: United Kingdom
  • Education: Master of Science, Oxford University
  • Marital Status: Married
  • Children: 4
  • Profile
    The Conservative PM guides the world's sixth largest economy. He has recently been criticized for a flip-flop approach to green taxes after he pledged to slash household energy bills.

Michael Duke

    Michael Duke
  • CEO, Wal-Mart Stores
  • Age: 64
  • Residence: Rogers, AR
  • Country of Citizenship: United States
  • Marital Status: Married
  • Children: 3
  • Profile
    Chief of the world's No. 1 retailer (just under $470 billion in sales in 2012) and biggest private employer (2.2 million employees). Wal-Mart can make or break a company simply by deciding to stock its product.

Mario Draghi

    Mario Draghi
  • President, European Central Bank
  • Age: 66
  • Residence: Rome, Italy
  • Country of Citizenship: Italy
  • Education: Doctorate, Massachusetts Institute of Technology
  • Marital Status: Married
  • Children: 2
  • Profile 
    As chief banker of the world's largest ­currency area--the euro zone's collective GDP is now nearly $17 trillion--Draghi faces the Herculean task of trying to maintain financial unity across 17 countries.