David Heinemeier Hansson (nextangle) stworzył Ruby on Rails podczas pracy nad Basecamp. Udostępnił framework jako open source w lipcu 2004, ale nie udostępniał innym praw do zapisu do lutego 2005. Among the core team, he's infamous for his ruthless delegation, which is often executed as a request to "Please Do Investigate". He's a partner at 37signals and an opinionated blogger.

Jeremy Kemper (bitsweat) is a programmer at 37signals hailing from Portland, Oregon. Hot on the heels of DHH, he has been the most active contributor to Rails. He's knee deep in pretty much all aspects of the framework and one of the top batters against new, incoming tickets.

Jamis Buck (minam) is a repentant Java programmer who never really enjoyed Java, but who finally found web-programming joy in Rails. He is an avid Ruby programmer, having contributed several packages to the community (including Net::SSH, Net::SFTP, Syntax, sqlite-ruby, sqlite3-ruby, SwitchTower and others). He is currently employed at 37signals, working from his home in Provo, Utah. He and his wife Tarasine have been married for 8 years. They have two children.

Nicholas Seckar (ulysses) is a student and software engineer living in Toronto, Canada. Nicholas has been contributing to Ruby and Rails since Fall 2004, with numerous bug fixes and new features such as Routing. He has been a developer on Measure Map since August 2005. He is currently completing his undergraduate degree at the University of Toronto, while also working for Google in their Toronto engineering department.

Florian Weber (csshsh) began using Rails in early 2004. Since then he's played an integral role in several Rails-based projects. He developed the CMS and webshop for bellybutton.de, and later worked on Odeo. In Spring 2006 he began working on Twitter as lead developer. At the moment, he is living in Berlin, Germany and working as a software developer.

Marcel Molina Jr. (noradio) is a language enthusiast who went from being a literature major to a programmer. In his transition from natural language to machine language he found Ruby an elegant balance of dynamic, pragmatic and "humane". And then came along Rails... Marcel is a software consultant and tumblelogs at Projectionist.

Michael Koziarski (nzkoz) is a software consultant based in Wellington, New Zealand. After a successful stint as an enterprise Java developer, he switched to rails shortly after the first public release. He’s a contributor to The Rails Way and maintains a personal blog.

Sam Stephenson (sam-) is a fan of dynamic languages who found Ruby just six months before Rails’ first release. In February of 2005, he released the Prototype JavaScript library, which provides the foundation for Ajax support in Rails. Sam lives in Chicago, works for 37signals, and tumblelogs on Projectionist.

Scott Barron (htonl) was set to swear off computers forever and become a plumber when Rails was released. He immediately found salvation in the warm embrace of Ruby and has never looked back. He currently practices Rails by working for Joyent.

Thomas Fuchs (madrobby) is a software architect from Vienna, Austria. He is the author of script.aculo.us, a cross-browser JavaScript framework featuring advanced Ajax UI controls, visual effects and other niceties. Thomas wrote the “Web 2.0” chapter in the Agile Web Development with Rails book. As a member of wollzelle, he is busy making fluxiom the next big thing in Digital Asset Management.

Tobias Lütke (xal) encountered Rails while struggling to find technology for his new company. Once found, he quickly ported the bits and pieces of his code over to Ruby which later became the first rails based e-commerce store “Snowdevil”. Tobi is a partner at JadedPixel and is frantically working on Shopify which is the continuation of the Snowdevil code base. Over time, Tobi released many open source projects such as Typo, Hieraki, and Liquid.

Rick Olson (technoweenie) blames Ruby on Rails for destroying his ASP.Net career. He's been using Rails actively since 2005 and is now working on making issue tracking enjoyable with Lighthouse. He's also released several open source projects, such as Mephisto, Beast, along with numerous plugins.