Theo Albrecht

$18.8 billion
Supermarkets/Germany
87. Married, two children

Runs discount supermarket group Aldi Nord; firm holding up amid economic downturn. Sales expected to hit $31 billion in 2008. After World War II he and older brother Karl transformed their mother's corner grocery into Aldi. Brothers split ownership in 1961; Karl took the stores in southern Germany, plus the rights to the brand in the U.K., Australia and the U.S. Theo got the northern Germany stores and the rest of Europe. Unable to operate Aldi stores in U.S., Theo developed discount food store Trader Joe's; now has more than 320 U.S. stores. Also owns stake in Supervalu. Became a recluse after being kidnapped for 17 days in 1971; said to collect old typewriters, loves golf

Warren Buffett Facts

$37 billion
Investments/U.S.
78. Widowed, remarried; three children

Last year America's most beloved investor was the world's richest man. This year he has to settle for second place after losing $25 billion in 12 months. Shares of Berkshire Hathaway down 45% since last March. Injected billions of dollars into Goldman Sachs, General Electric in exchange for preferred stock last fall; propped up insurance firm Swiss Re in February with $2.6 billion infusion. Admits he made some "dumb" investment mistakes in 2008. Upbeat about America's future: "Our economic system has worked extraordinarily well over time. It has unleashed human potential as no other system has, and it will continue to do so." Scoffs at Wall Street's over-reliance on "history-based" models: "If merely looking up past financial data would tell you what the future holds, the Forbes 400 would consist of librarians." Son of Nebraska politician delivered newspapers as a boy. Filed first tax return at age 13, claiming $35 deduction for bicycle. Studied under value investing guru Benjamin Graham at Columbia. Took over textile firm Berkshire Hathaway 1965. Today holding company invested in insurance (GEICO, General Re), jewelry (Borsheim's), utilities (MidAmerican Energy), food (Dairy Queen, See's Candies). Also has noncontrolling stakes in Anheuser-Busch, Coca-Cola, Wells Fargo

Information about Karl Albrecht

$21.5 billion
Supermarkets/Germany
89. Married, two children

Germany's richest person owns discount supermarket giant Aldi Sud. Retailer faring well amid economic downturn; analysts expect its 2008 sales to be up 9.4% to $33.7 billion. Sales in the U.S. up estimated 20% last year to $7 billion. Plans to open 75 U.S. stores in 2009, including first in New York City. With younger brother, Theo, transformed their mother's corner grocery store into Aldi after World War II. Brothers split ownership in 1961; Karl took the 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. Retired from daily operations. Fiercely private: little known about him other than that he apparently raises orchids and plays golf.

Facts about Ingvar Kamprad

$22 billion
Ikea/Sweden
83. Divorced, remarried; four children

Peddled matches, fish, pens, Christmas cards and other items by bicycle as a teenager. Started selling furniture in 1947. Opened first Ikea store 50 years ago; store's name is a combination of initials of his first and last name, his family farm and the nearest village. Retired in 1986; company's "senior adviser" still reportedly works tirelessly on his brand. Discount retailer now sells 9,500 items in 36 countries; prints catalog in 27 languages. Revenues up 7% to $27.4 billion in fiscal-year 2008. Opened 10th store in China this February; planning to open first in Dominican Republic later this year. Three sons all work at the company. Thrifty entrepreneur flies economy class, frequents cheap restaurants and furnishes his home mostly with Ikea products.