For several years took charge of the technology of Google’s indexing. This is the system that “crawled” through all the Web, gathering all its contents so the company could provide the equivalent of a back-of-the-book index of the world’s biggest tome. Part of his job was expanding the index, convincing not only web administrators but also publishers, businesses and government agencies to allow Google to crawl their data. He was also in charge of keeping the index fresh, a massive task that involved pushing computer science to the limit.