Ali Abdaal is a doctor and one of the world's most-followed productivity experts. In 2017, during his final year at Cambridge University, Ali started posting YouTube videos about health and productivity. His channel now has 7 million monthly views and over 3.4 million subscribers - growing by tens of thousands each month - and his acclaimed online productivity courses have hundreds of thousands of paying students. In addition to his work as a productivity expert, Ali is a medical school lecturer, a junior doctor in the UK's National Health Service, and a part-time magician.