Ola Bini, ThoughtWorks
Ola Bini is a Swedish developer currently working for ThoughtWorks in London, United Kingdom. He has been one of the core developers for JRuby since 2006 and is the author of the APress book Practical JRuby on Rails. He has much experience with Java, Ruby and LISP, and has been involved with several other open source projects - but nowadays JRuby takes most of his time.
He has been known to like implementing languages, writing regular expression engines, YAML parsers and other similar things that exist at the border of computer science.