Rack and Rubinius Core Team member

Konstantin Haase

As current maintainer of Sinatra, Konstantin is an Open Source developer by heart. Ruby has become his language of choice since 2005. He regularly contributes to different widespread projects, like Rubinius, Rack and Redcar. In 2010, he successfully took part in the Ruby Summer Of Code, working on Rails internals. When he's not studying IT Systems Engineering at the Hasso Plattner Institute in Potsdam, Germany, he's either in Berlin working for finnlabs as a Rails developer or in Portland, Oregon, working on Rubinius for Engine Yard. You can find him on github, twitter or read his blog.

Rails Core Team member

Aaron Patterson

When he isn't ruining people's lives by writing software like phuby, enterprise, and neversaydie, Aaron can be found writing slightly more useful software like nokogiri. To keep up his Gameboy Lifestyle, Aaron spends his weekdays writing high quality software for ATTi. Be sure to catch him on Karaoke night, where you can watch him sing his favorite smooth rock hits of the 70's and early 80's.

Rails Core Team member

Yehuda Katz

Yehuda Katz is a member of the SproutCore, Ruby on Rails and jQuery Core Teams; during the daytime, he works as Chief Technologist at Strobe. Yehuda is the co-author of the best-selling jQuery in Action, the upcoming Rails 3 in Action, and is a contributor to Ruby in Practice. He spends most of his time hacking on open source—his main projects, along with others, like Thor, Handlebars and Janus or traveling the world doing evangelism work. He blogs at http://yehudakatz.com and can be found on Twitter as @wycats.

Rails Core Team member

José Valim

José Valim (@josevalim) is a Rails Core member and author of Crafting Rails Applications. Also, he is the lead-developer of Plataforma Tec, a Ruby on Rails consultancy firm based in Brazil. He started working with Ruby in late 2006 and since then he's been working on several open source projects.

Wannabe Batman

Marcin Bunsch

R&D Manager at Future Simple whose greatest passion is coding. Usually seen researching awesome new solutions for use in Future Simple products. When not doing that, he's probably working on some crazy code that you can find on https://github.com/marcinbunsch. Tweets as @marcinbunsch.

CoffeeScript Advocate

Sebastian Deutsch

Sebastian is one of the founders of 9elements, a small software boutique from Germany. He loves to program shiny things and as a CoffeeScript Sensei, he wants to share his experience doing some serious CoffeeScript business. When he's not coding for a living, he's hacking on watchlater a video boomarking solution for iPhone and iPad. Follow his chitchat @sippndipp.

Code Sailor

Mariusz Łusiak

CTO at Applicake and happily still coding himself. In love with OOP and TDD. Willing to help you with code refactoring at all times, preferably via pair programming. Tweets as @mariuszlusiak and keeps open source code on github as mariuszlusiak. Football coach after hours. Has been sailing since the moment he was born.

Rails Core Team member

Jon Leighton

Jon Leighton is a freelance Ruby consultant from Oxford, UK. When he occasionally goes AFK, Jon enjoys dangling from small bits of rock on the sides of cliffs and mountains. You can follow @jonleighton, or read his blog.

Rum and Code

Elliott Kember

Elliott Kember (@elliottkember) is an all-singing, all-dancing developer who spends most of his time drinking rum, wearing hats, and listening to dubstep. One third of Riot, Elliott is a Rails, Javascript and HTML/CSS guy by trade. He enjoys climbing trees and throwing things. He also wrestles helicopters and flies crocodiles.

Rails Girl

Linda Liukas

Linda (@lindaliukas) is a casual programmer from Helsinki, Finland. Having never really outgrown fairytales, she sees the web as a maze of stories and wants to hear more female voices in that world. Her aim is to give girls the tools and the vocabulary to enter the playground and build the world of web as they see it - more Sofia Coppola, less Barbie. Dividing her time between Helsinki and San Francisco, Linda loves 3D printers, Muji and Zelda Fitzgerald.

Ruby Scientist

Tom Stuart

Tom is a freelance Ruby hacker and software engineer. He spends his time thinking, speaking, training and crafting Ruby code for clients including the BBC, BERG and the UK government, and has taught computer science at the University of Cambridge. Find him on Twitter as @tomstuart.

Some GitHub Guy

Zach Holman

A Ruby developer with sound fundamentals, firm grasp on the industry, and innovative development approaches are all phrases inapplicable to Zach Holman. He works at GitHub, and hacks on sparkline generators, robot music DJs, and ethically frightening FaceTime + Chatroulette mashups. He blogs, he tweets, he evades his taxes.

Simple Man

Corey Donohoe

Atmos is a Ski Patrol ranger who helps deploy code for GitHub when he's not pulling people off the mountains of California on his bared back or in his teeth. Surrounded at all times by his sidekick snow dogs, atmos fights crime as well as bugs. A lot of his publicly available code focuses on closing the gap between development and operations, leveraging various web apis, and even open sourcing GitHub's Hubot. Ruby is just one part of what he uses every day at GitHub to help keep things running smoothly behind the scenes. You can follow him on twitter.

Vim Evangelist

Ben Orenstein

Ben contributes to Rails, slings Ruby at thoughtbot, and evangelizes vim wherever he goes. Founder of the Boston Vim Meetup and Vim University. Railsberry will mark the third continent where he's presented about his favorite editor. He loves teaching and is always happy to help out fellow programmers (as long as they don't use emacs). Get in touch with him on twitter here: @r00k

Data Nerd

Eric Redmond

Eric is technical evangelist for MongoHQ, author of (the soon to be bestselling) Seven Databases in Seven Weeks, and other code, papers and books not relevant to this discussion. On his spare time, Eric enjoys drawing CRUDComic.com, posting on Twitter @coderoshi, and talking about himself in the third person.

Travis CI Foreman

Josh Kalderimis

Josh is a top-30 Ruby on Rails contributor and has been working with the framework since 2008. He maintains several open-source Ruby projects, including, linkedin, faraday_middleware and his own completeness-fu. He's also one of Amsterdam.rb's organizers, the one of the core members for the Travis-CI team.

Rails Core Team member

Xavier Noria

Xavier Noria (@fxn) is an independent Ruby on Rails consultant from Barcelona. Xavier is a Rails Core Team member and the author of Rails Contributors. Honored to have been presented a Ruby Hero Award at RailsConf 2010.