Marianne Liebmann

Heir to Minnesota company that piles food on America's plates. William Cargill, son of Scottish sea captain, started Cargill as a grain storage house in Iowa after Civil War. Will's son-in-law John MacMillan took reins 1909. Family owns 88% of company, employees the rest. Today sales exceed $120 billion. Net profits in 2008: nearly $4 billion, up 69% from previous year as global demand for commodities soared. Company controls food from stable to table; manufactures animal feed, meat, crops. Also involved in commodities trading, risk management. Owns majority of publicly traded fertilizer firm Mosaic; stock up 160% since last August. Marianne: daughter of James Cargill, who died in 2006.