caleb clausen
I’ve been doing ruby for several years now, and I’ve gotten pretty deep into it, as well as falling in love with the language.
I am the author of several ruby libraries: Reg (a pattern matching language), RubyLexer (intended to be a complete lexer of ruby in ruby), Sequence (a library of external iterators), and Ron (a ruby-based serialization format; like JSON, but with ruby rather than javascript).