George Foreman
Olympic boxing gold medalist and two-time world heavyweight champion
Foreman took in $137.5 million in 1999 when appliance maker Salton bought the rights to use his name and image for a grill. Since then, he has struggled to find a new hit.
Michael Jordan
Five-time most valuable player of the N.B.A.
Since his final retirement, in 2003, Jordan has purchased a stake in the Charlotte Bobcats, advised Nike’s Jordan division, and started a motorcycle-racing team.
Lenny Dykstra
World Series winner and three-time All-Star
Dykstra has started a chain of car washes in California, written an investment column for TheStreet .com, and founded a magazine aimed at teaching athletes how to invest their money.
Roger Staubach
Dallas Cowboys quarterback and two-time Super Bowl winner
Staubach founded the Staubach Co., a commercial-real-estate-advisory firm, in 1977. In July 2008, the firm was bought for $613 million by real estate giant Jones Lang LaSalle.
Jack Nicklaus
Eighteen-time major champion
The Golden Bear founded Nicklaus Design, which has planned 337 golf courses in 33 countries. His manufacturing company, Nicklaus Golf Equipment, does $30 million a year in sales.
Magic Johnson
Three-time most valuable player of the N.B.A.
In 1998, Johnson co-founded Canyon-Johnson Urban Funds, a private real estate fund that has nearly $2 billion in committed capital.