Yehuda Katz is a member of the Ember.js, Ruby on Rails and jQuery Core Teams; his 9-to-5 home is at the startup he founded, Tilde Inc., where he works on Skylight, a smart profiler for Rails apps. Yehuda is the co-author of the best-selling books jQuery in Action and Rails 3 in Action. He spends most of his time hacking on open source and traveling the world doing open source evangelism work. He blogs at http://yehudakatz.com and can be found on Twitter as @wycats.