About the Author
David Chisnall has in-depth knowledge of Cocoa as both an implementer and a developer. He is an active contributor to the GNUstep project, which provides an open source implementation of the Cocoa APIs, and cofounded the Étoilé project to build a desktop environment atop GNUstep. He has created a new Objective-C runtime library, worked on Objective-C support in the clang compiler, and published papers on Objective-C. He wrote a popular series of articles on Objective-C and Cocoa for informIT.com and is the author of The Definitive Guide to the Xen Hypervisor (Addison-Wesley, 2008).