Stephen G. Kochan has been developing software and writing books for over 20 years. He is the author and coauthor of several best-selling titles on the C language, including Programming in C and Programming in ANSI C (both from Sams Publishing), Programming C for the Mac (Macmillan Computer Publishing), and Topics in C Programming (Wiley Publishing), as well as several Unix titles, including Exploring the Unix System and Unix Shell Programming (both Sams Publishing), and Unix System Security (Hayden Books). His most recent title on Mac programming is Programming in Objective-C (Sams Publishing), which is a tutorial on the primary programming language used on the Mac for application development.