Addy Osmani is an engineering manager working on Google Chrome. His team focuses on speed, helping keep the web fast. Devoted to the open-source community, Addy’s past open-source contributions include Lighthouse (an auditing tool for performance and web best practices), Workbox (libraries for offline-caching files using service workers), Yeoman (the web scaffolding tool), Critical (the critical-path CSS optimization tool), and TodoMVC. Addy is the author of books like “Image Optimization” and “Learning JavaScript Design Patterns”.