Sal Khan’s career journey took him from finance to the classroom. The former hedge fund manager now runs the nonprofit Khan Academy, which provides free online education. He says online learning is changing the way students learn and instructors teach. For classrooms that have integrated the Academy into their lessons, students are learning at their own pace and teachers have more time to tutor kids one-on-one. In this conversation, Khan talks about how the Academy is personalizing education for its 60 million users worldwide.