Theo Hultberg is Chief Architect at Burt, a Göteborg based big data startup that wants to revolutionize the advertising industry by showing that there's more to ad analytics than clicks. He’s the co-organizer of his local Ruby, Scala, and distributed systems user groups, but his only claim to fame is that he has more reputation on Stack Overflow than Jeff and Joel combined.

Makoto is a web developer at New Bamboo, based in London. He is the organiser of the London d3.js Meetup and created a screencast called The Joy of d3.js. In his spare time, he works on the Benkyo Player, a video caption search and note sharing site for online learning videos.

Alex is a software engineer. He spends much of his time contributing to open source projects, chief among them: Topaz, PyPy, Django, and CPython. He loves compilers, improving the art of software engineering, and designing great APIs.

Pat Shaughnessy writes a blog about Ruby development at patshaughnessy.net, and just published a book on Ruby internals called Ruby Under a Microscope. When he's not at the keyboard, Pat enjoys spending time with his wife and two kids. Pat is also a fluent Spanish speaker and travels frequently to Spain to visit his wife's family.

Rails committer, Jumpstart Lab instructor, nomad philosopher.