Mark Dalrymple is a longtime Mac and Unix programmer, working on cross-platform toolkits, Internet publishing tools, high-performance web servers, and end-user desktop applications. He is also the principal author of Learn Objective-C on the Mac (Apress, 2009) and Advanced Mac OS X Programming (Big Nerd Ranch, 2005). In his spare time, Mark plays trombone and bassoon, and makes balloonanimals.