Kevin Systrom

Cofounder, CEO, Instagram

Kevin Systrom began his storied career in tech as an intern at Odeo, better known as the first incarnation of Twitter. He did a stint at Google before launching Instagram, which he and his partner Mike Krieger founded together. In 2012, only 18 months after Instagram's launch, Mark Zuckerberg offered and eventually bought the photo-sharing app for $1 billion.