chromatic is the pen name of a writer and free software programmer who resides in Hillsboro, Oregon, United States. He is the author of Extreme Programming Pocket Guide, a co-author of Perl Testing: A Developer's Notebook, the lead author of Perl Hacks, and an uncredited contributor to The Art of Agile Development. He has contributed to CPAN, Perl 5, Perl 6, and Parrot.