Yehuda Katz is a member of the Ruby on Rails core team, and lead developer of the Merb project. He is a member of the jQuery Core Team, and a core contributor to DataMapper. He contributes to many open source projects, like Rubinius and Johnson, and works on some he created himself, like Thor.
Throne of JS — Seven Frameworks is a two day, single-track conference focused on answering the question on every web developer's mind: which framework? We're bringing together the creators of every important client-side .js framework to speak about their creations so that you can decide when to use what.