Hampton Catlin
Hampton Catlin is the inventor of Sass, a CSS generating language, and the Haml markup language
He is the original creator of Wikipedia Mobile (m.wikipedia.org) and is also the creator of several successful iPhone applications including Dictionary!
Hampton is currently building crazy new technologies to mobilize the web at Moovweb.
Merb Article
I wrote a pretty in-depth overview of Merb over at Rethink for anyone whose interested.