Tim Berners-Lee was born in London in 1955 to two parents who had worked on one of the first commercial computers, read physics at Oxford, and in March 1989 handed his manager at CERN a proposal for an information management system. The response, famously, was ‘vague but exciting’. By the end of that year he had written the first web browser, the first web server, and the specifications behind HTML, URLs and HTTP.
The decision that mattered most came next. He and CERN released the lot royalty-free, refusing to patent the web, and everything built since rests on that choice. He founded the World Wide Web Consortium in 1994 and has spent three decades arguing about what the thing ought to become, latterly through the Open Data Institute and his work on personal data ownership.
He was knighted in 2004, received the Turing Award in 2016, and appeared at the London Olympics opening ceremony to type four words: this is for everyone.