Traditionally, Tom Rielly closes the TED Conference with a merciless 18-minute monologue, skewering all the speakers with his deadpan delivery, spot-on satire and boundary-less performance (complete with PowerPoint, pratfalls and partial nudity).
Pastor Rick Warren is the author of The Purpose-Driven Life, which has sold more than 30 million copies worldwide. His has become an immensely influential voice seeking to apply the values of his faith to issues such as global poverty, HIV/AIDS and injustice.
José Antonio Abreu founded El Sistema in 1975 to help Venezuelan kids learn to play musical instruments and be part of an orchestra. The TED Prize winner's bold idea has seeded hundreds of youth orchestras -- and many happy lives.
Daily Beast columnist and co-host of the "Democracy-ish" podcast, recovering attorney, playwright, author and exhausted dad Wajahat Ali celebrates the diverse narratives of the United States and advocates for a more inclusive cultural landscape.
In 2004, Sal Khan, a hedge fund analyst, began making math tutorials for his cousins. Twelve years later, Khan Academy has more than 42 million registered users from 190 countries, with tutorials on subjects from basic math through economics, art history, computer science, health, medicine and more.