I'm Frederick Cheung, a UK based rails developer. I work for a company called kgb, where I'm the chief wizard and work on all sorts of different parts of the rails apps used to answer your questions. I've also written software for the Mac and contributed a modest amount of material to rails itself.
You may have encountered me on the rubyonrails-talk mailing list or IRC channel where I answer a fair few questions. If you need to contact me the easiest way is probably to lift my email address from there (if you're lazy then it's the obvious thing @gmail.com). If you're a recruitment consultant, please do not email. Do however set yourself on fire.
If you're into the working with rails thingy, my profile is here. I have a few things up on github.