'My lowest point'

These under-40 success stories look back on when things weren't so great and the lessons they've learned along the way.

David Chang
40u40 main david chang
Age: 35
40 Under 40 rank: 31

The first 9 months of Momofuku Noodle Bar. It was not an instant success, trying to keep that restaurant afloat was a Sisyphean hell.

  @FortuneMagazine - Last updated October 11 2012 10:33 AM ET
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