The tutorial source is John Resig, the creator of jQuery and a prominent figure in the JavaScript community. His website, ejohn.org, offers various resources and tutorials for web developers, particularly those interested in JavaScript and jQuery.
This tutorial focuses on advanced JavaScript concepts and techniques. It aims to deepen the learner's understanding of JavaScript's more complex features, including closures, prototypes, and object-oriented programming in JavaScript. The course likely covers topics that go beyond basic syntax and delves into the language's nuances and powerful capabilities.