Bryan Costales lives and writes in San Francisco, California. He has been active in system administration and software development for more than 20 years and has been writing articles and books about computer software for more than 25 years. His most notable books are C from A to Z (Prentice Hall), Unix Communications (Howard Sams), and sendmail (O'Reilly). In addition to technical books, he also writes fiction and hosts a free multimedia web site.