Steve works at Google on web performance and open source initiatives. He previously served as Chief Performance Yahoo!. Steve is the author of High Performance Web Sites and Even Faster Web Sites. He is the creator of YSlow, one of the top 25 of 2 billion Firefox add-ons. He’s created many other performance tools and services including Cuzillion, Jdrop, ControlJS, and Browserscope. He serves as co-chair of Velocity, the web performance and operations conference from O’Reilly, and is co-founder of the Firebug Working Group. He taught CS193H: High Performance Web Sites at Stanford University.