Entrepreneurs keep getting younger and younger, while their companies only get bigger. From solar energy to lobster trapping, the members of our annual 30 Under 30 list are shaking up a variety of industries -- and doing it on their own terms. Meet the next big stars of the business world.

The Transformer
Most aspiring college entrepreneurs usually write business plans for new companies. Aaron Hall wanted to breathe life into an old one. Today, he's running Borrego Solar Systems, a $60 million company at the forefront of the green energy movement.
The Contractor
Uncle Sam can be a very good customer. But landing government contracts is a tricky business, where red tape reigns supreme and bigger, more established companies have an edge. Try telling that to Sumi Krishan, who landed her first deal as a teenager.
The Trappers
For generations, Maine has been the unofficial lobster capital of the world. But it took a pair of 20-something brothers to directly link seafood connoisseurs with the state's lobstermen. That John Ready and Brendan Ready have been catching lobster since childhood might have something to do with it.
The Number-Cruncher
America is drowning in a sea of debt. Aaron Patzer created a program to simplify people's finances -- and help them make smarter spending decisions.