
COO
Facebook
2007 rank: 29Age: 39
In March, Sandberg jumped from Google to Facebook, where she aims to build another lucrative model. With 100 million registered users and only 700 employees, Sandberg is scaling the organization fast while helping 24-year-old CEO Mark Zuckerberg take his phenom global.
NEXT: Meredith Whitney
Last updated October 16 2008: 10:16 AM ET