Our Principal has Authored a couple of books and has been a Tech Reviewer for quite a few more books. The books authored are listed below.
Pro Bash Programming
Link: http://www.apress.com/9781484201220
More iPhone Development with Objective-C
Link: http://www.apress.com/9781430260370
More iPhone Development with Swift
Link: http://www.apress.com/9781484204498
XCode 6 Essentials
Link: https://www.packtpub.com/application-development/xcode-6-essentials
