Stoyan Stefanov is a Facebook engineer. Previously at Yahoo, he was the creator of the smush.it online image-optimization tool and architect of the YSlow 2.0 performance tool. Stoyan is the author of JavaScript Patterns and Object-Oriented JavaScript, a contributor to Even Faster Web Sites and High-Performance JavaScript, he's a blogger (phpied.com) and a frequent speaker at conferences including Velocity, JSConf, Fronteers, and many others.
