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Stoyan Stefanov

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