13. Marilyn Carlson Nelson
Net Worth: $4 billion
Source of wealth: Carlson Inc.
Age: 73
Overall Rank: 92
Jointly owns Carlson Inc.--with hotel (Radisson, Country Inns & Suites), restaurant (T.G.I. Friday's) and travel (Carlson Wagonlit Travel) divisions--with her sister, Barbara Carlson Gage, and chairs the board. Her father, Curt (d. 1999), founded the company in the 1930s.