George Schlossnagle is a contributor to the PHP project and an Apache module author with years of hands-on experience in building large-scale PHP sites and applications. for two years he was the senior architect at one of the largest PHP sites on the Web (serving over 130 million dynamic PHP pages per day). He is also the author of the APC compiler cache and the APD profiler (Zend engine extensions), both developed to increase performance on highly transactional Web systems. He is a regular speaker at leading open source conferences such as OSCON, PHP-Con, and ApacheCon. He and his brother Theo now runs OmniTI, a consulting company specializing in scalable Web applications. He lives in Md.