MIT Technology Review, as a rule, focuses on the technology first—the breakthrough, the surprise, the accidental discovery with the potential to upend the way we live. Our annual look at 35 outstanding innovators under 35 is a reminder that behind all those innovations are people with dreams, fears, and ambitions. Sometimes they hack away at a problem for years before figuring out a way forward. Sometimes they stumble on a solution they didn’t know they were searching for. We hope these portraits offer a sense of the variety of work being done in technology, and a sense of what’s coming next.