perrin (email not shown publicly) Perrin is a contributor to various Perl-related projects like mod_perl, Template Toolkit, and Class::DBI. He is a frequent speaker at OSCON, YAPC, and ApacheCon, and a contributor to several perl-related books.
Who would've thought? A Ruby programmer finally acknowledged that writing code which modifies other people's classes at runtime might not have been the best idea for writing maintainable code. He advocates writing and using actual APIs instead.