Net Worth Last Calculated: March 2011
Source: Aldi, self-made
Age: 91 , Citizenship: Germany
Residence: Mulheim an der Ruhr, Germany
Marital Status: Married , Children: 2
Germany's richest man, owns discount-supermarket giant Aldi Sud (estimated sales: $40 billion). Younger brother, Theo, also a billionaire, died in July 2010. After World War II brothers transformed mother's corner grocery store into Aldi.
They split ownership in 1961; Karl took the more profitable stores in southern Germany, plus the rights to the brand in the U.K., Australia and the U.S. Theo got northern Germany and the rest of Europe. Aldi has over 1,100 stores in the U.S. across 31 states; plans to open it's first in New York City in 2011.