Technically he's a javascript "star guy". Thomas Fuchs, creator of the script.aculo.us library and core contributor to the Prototype library. Both libraries have been a big part of Rails development for years although many people are now moving to jQuery.

Yeah, that's true -- I (Amy Hoy) actually have more Ruby fame than Thomas does. But he's more hardcore in reality. :)

Hi there. Amy here. FYI, while yes, I'm the designer/interaction designer/ux/whatever person, I'd like to add that I do the project lead stuff. The idea was mine; the market research mine; the positioning, differentiation, the determination of our initial feature set, and pricing all mine. I find and hire the freelancers. I meet with the productivity coach. I come up with advertising/promo opportunities. Etc.

This is not me being all "I DID ALL THE WORK WOOHOO!" -- far from it. I'd just like to note that there is far more that needs to be done for a successful app than just code + design. I think people don't realize that, when they see 1 or 2 creators listed by narrow roles, for a successful product.