Susan Wojcicki CEO, YouTube

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When Susan Wojcicki, a longstanding Googler and ad executive, was picked to run YouTube in early 2014, she had her work cut out for her. Her main job was to help YouTube monetize its audience more effectively. Part of that included finding ways for YouTube to promote its home-grown stars like Bethany Mota and the Epic Rap Battles duo and attract more high-quality and deep-pocketed advertisers to the service.

To help build out YouTube's tech offerings, Wojcicki has made a number of internal "hires." She also confirmed onstage at Re/code’s Code/Mobile conference in October that YouTube would explore the launch of an ad-free subscription service.