He is one of the creators of Ember.js, a member of the Rust Core Team, and a retired member of the Ruby on Rails and jQuery Core Teams. He is a member of ECMAScript's TC39 standards committee, and a former member of the W3C's TAG (Technical Architecture Group). His 9-to-5 home is at the startup he founded, Tilde Inc.. There he works on Skylight, the smart profiler for Rails, and does Ember.js consulting. He's best known for his open source work, which also includes having created projects like Thor, Handlebars, Bundler and Cargo. He travels the world doing open source evangelism and web standards work and can be found on Twitter as @wycats.