Google's (Fortune 500) highest-ranking woman, Wojcicki spends the majority of her time at company headquarters in Mountain View, Calif. (Not surprisingly, she uses technology and videoconferencing to connect with product managers and engineers in 10 countries.) A particular focus: serving small advertisers in countries that are just gaining access to the Internet. ,
On Feb. 5, Google announced that Wojcicki is replacing Salar Kamangar (Google employee No. 9) as head of YouTube. The move allows Wojcicki to manage her own Google division, after years overseeing Google's massive advertising and commerce platforms, and continue to boost YouTube's ad revenue: eMarketer estimates it grew 61% in 2013, netting $1.96 billion.