David Heinemeier Hansson is the original author of Ruby on Rails. He is also a partner in 37signals. The company behind Basecamp, Highrise, Backpack, Campfire, Writeboard, and Ta-da List. For the work on Rails, he won Best Hacker of the Year 2005 at OSCON from Google and O'Reilly. And in 2006, he accepted the Jolt award of product excellence for Rails 1.0.
Obie Fernandez is author of the The Rails Way and the editor of Addison-Wesley's Professional Ruby series He founded and heads Hashrocket, a company offering Ruby development services Obie founded the Ruby practice at ThoughtWorks and is a proponent of rails maturity models.
Jim Weirich is the Chief Scientist for EdgeCase LLC, and is the creator of rake. Jim is very active in the Ruby community, presenting at many conferences and contributing to open source projects such as RubyGems and flexmock. Jim blogs at http://onestepback.org/.
Jonathan Siegel is the founder of ELC Technologies, which has its headquarters in Santa Barbara, California, and president of ELC Technologies’ London-based operation, which services clients throughout Europe. As founder of ELC, Jonathan has established long-term relationships with global corporations including Cisco Systems, LiveNation, Formula 1 and others. As an entrepreneur, Jonathan has played a founding role in several Ruby on Rails product businesses including RightCart.com, RightScale.com and now RightSignature.com.