'My biggest mistake'

The folks on Fortune's 40 under 40 list may be rising stars, but they're not perfect. Here are the decisions they most regret in their careers.

Full list: Top 40 Meet these young innovators, value creators, and agents of change. More
20 highest paid Which young executives at public companies raked it in - and how much did they earn? More
They're hiring! These stars on our list have great jobs to fill. What are they looking for and how can you impress them? More
8 over 80 Youth isn't everything. These aging titans are still cutting deals and calling the shots. More
Can you pass the '40 under 40' test? Take our quiz and see how much you know. More
Full list: Top 40 Meet these young innovators, value creators, and agents of change. More
20 highest paid Which young executives at public companies raked it in - and how much did they earn? More
They're hiring! These stars on our list have great jobs to fill. What are they looking for and how can you impress them? More
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